SonicWall Email Security Path Traversal Vulnerability

cve CVE-2021-20023 2 sources, 2 claims · Watch

CISA Known Exploited Vulnerabilities writes:
SonicWall Email Security Path Traversal Vulnerability SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation. Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-20023 the claim

What it is to other things

affects	microsoft/windows NVD
affects	sonicwall/email_security NVD
affects	sonicwall/email_security_appliance_3300 NVD
affects	sonicwall/email_security_appliance_3300_firmware NVD
affects	sonicwall/email_security_appliance_4300 NVD
affects	sonicwall/email_security_appliance_4300_firmware NVD
affects	sonicwall/email_security_appliance_5000 NVD
affects	sonicwall/email_security_appliance_5000_firmware NVD
affects	sonicwall/email_security_appliance_5050 NVD
affects	sonicwall/email_security_appliance_5050_firmware NVD
affects	sonicwall/email_security_appliance_7000 NVD
affects	sonicwall/email_security_appliance_7000_firmware NVD
affects	sonicwall/email_security_appliance_7050 NVD
affects	sonicwall/email_security_appliance_7050_firmware NVD
affects	sonicwall/email_security_appliance_8300 NVD
affects	sonicwall/email_security_appliance_8300_firmware NVD
affects	sonicwall/email_security_appliance_9000 NVD
affects	sonicwall/email_security_appliance_9000_firmware NVD
affects	sonicwall/email_security_virtual_appliance NVD
affects	sonicwall/hosted_email_security NVD
made_by	microsoft NVD
made_by	sonicwall NVD

What each source says

Property	Source	Said	Means here
Cvss cvss	NVD	4.9 receipt Source NVD Its words `4.9` Read by `field:cve.metrics.cvssMetricV31[].cvssData.baseScore` Said since 2026-10-02 12:00 UTC Last answered 2026-10-04 12:15 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "product": "Email Security", "vendor": "SonicWall", "versions": [ { "status": "affected", "version": "10.0.9 and earlier" } ] } ], "source": "PSIRT@sonicwall.com" } ], "cisaActionDue": "2021-11-17", "cisaExploitAdd": "2021-11-03", "cisaRequiredAction": "Apply updates per vendor instructions.", "cisaVulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability", "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:sonicwall:email_security::::::::", "matchCriteriaId": "5EA2AE41-BCD4-4F77-8883-D201C1AFD110", "versionEndExcluding": "10.0.9.6173", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:o:microsoft:windows:-:::::::", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_9000_firmware::::::::", "matchCriteriaId": "0A418BFA-C4E6-4473-9740-794107F86084", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_9000:-:::::::", "matchCriteriaId": "C2434930-79AB-4AA9-AAC8-B116F3CD5CC0", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_3300_firmware::::::::", "matchCriteriaId": "28AF18A3-3E72-400A-81A3-E0D32D550FC1", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_3300:-:::::::", "matchCriteriaId": "ECF2B5A6-B62F-444E-BDB3-0084896CD83B", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_4300_firmware::::::::", "matchCriteriaId": "738196AF-ECBE-4AC2-914E-1DCF74DFD6A9", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_4300:-:::::::", "matchCriteriaId": "A18DCCAF-A373-4550-805B-EF329643B068", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_8300_firmware::::::::", "matchCriteriaId": "4667576A-993F-4622-B7AC-AC62DD6EFDFA", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ 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"cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_7000:-:::::::", "matchCriteriaId": "A114E829-5FC6-4321-8D28-C63EC09F9099", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_5050_firmware::::::::", "matchCriteriaId": "AD7A6C11-2167-4294-97E9-C467EE9E1B78", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_5050:-:::::::", "matchCriteriaId": "271F06DD-8DAA-46EF-A803-659EA253CC63", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:sonicwall:email_security_appliance_7050_firmware::::::::", "matchCriteriaId": "B6220761-AC7E-42BD-A028-CC12EE9B3430", "versionEndExcluding": "10.0.9.6177", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": "cpe:2.3:h:sonicwall:email_security_appliance_7050:-:::::::", "matchCriteriaId": "443B635B-6B08-479B-A635-26724B192BF0", "vulnerable": false } ], "negate": false, "operator": "OR" } ], "operator": "AND" }, { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:sonicwall:email_security_virtual_appliance::::::::", "matchCriteriaId": "27799885-B16C-4B14-A780-54E7E20B6CB3", "versionEndExcluding": "10.0.9.6177", "vulnerable": true }, { "criteria": "cpe:2.3:a:sonicwall:hosted_email_security::::::::*", "matchCriteriaId": "DCFC13F9-2DE3-412F-8C8B-847C81811B11", "versionEndExcluding": "10.0.9.6173", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host." }, { "lang": "es", "value": "SonicWall Email Security versión 10.0.9.x, contiene una vulnerabilidad que permite a un atacante autenticado posteriormente leer un archivo arbitrario en el host remoto" } ], "id": "CVE-2021-20023", "lastModified": "2026-10-01T21:17:16.097", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N", "version": "2.0" }, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ], "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2021-20023", "options": [ { "exploitation": "active" }, { "automatable": "yes" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2026-08-12T03:55:24.717669Z", "version": "2.0.3" } } ] }, "published": "2021-04-20T12:15:12.587", "references": [ { "source": "PSIRT@sonicwall.com", "tags": [ "Vendor Advisory" ], "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Vendor Advisory" ], "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010" }, { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": [ "US Government Resource" ], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023" } ], "sourceIdentifier": "PSIRT@sonicwall.com", "vulnStatus": "Analyzed", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-22" } ], "source": "PSIRT@sonicwall.com", "type": "Secondary" }, { "description": [ { "lang": "en", "value": "CWE-22" } ], "source": "nvd@nist.gov", "type": "Primary" } ] } }	—
Cwes cwes	CISA Known Exploited Vulnerabilities	CWE-22 receipt Source CISA Known Exploited Vulnerabilities Its words `CWE-22` Read by `field:cwes` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Due date due_date	CISA Known Exploited Vulnerabilities	2021-11-17 receipt Source CISA Known Exploited Vulnerabilities Its words `2021-11-17` Read by `field:dueDate` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Exploited exploited	CISA Known Exploited Vulnerabilities	yes receipt Source CISA Known Exploited Vulnerabilities Its words `yes` Read by `const:yes` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Forensic triage forensic_triage	CISA Known Exploited Vulnerabilities	false receipt Source CISA Known Exploited Vulnerabilities Its words `No` Read by `field:forensicTriage` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Known ransomware campaign use known_ransomware_campaign_use	CISA Known Exploited Vulnerabilities	Known receipt Source CISA Known Exploited Vulnerabilities Its words `Known` Read by `field:knownRansomwareCampaignUse` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Product product not compared	CISA Known Exploited Vulnerabilities	SonicWall Email Security receipt Source CISA Known Exploited Vulnerabilities Its words `SonicWall Email Security` Read by `field:product` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—
Product product not compared	NVD	Email Security receipt Source NVD Its words `Email Security` Read by `field:cve.affected[].affectedData[].product` Said since 2026-10-02 12:00 UTC Last answered 2026-10-04 12:15 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "product": "Email Security", "vendor": "SonicWall", "versions": [ { "status": "affected", "version": "10.0.9 and earlier" } ] } ], "source": "PSIRT@sonicwall.com" } ], "cisaActionDue": "2021-11-17", "cisaExploitAdd": "2021-11-03", "cisaRequiredAction": "Apply updates per vendor instructions.", "cisaVulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability", "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:sonicwall:email_security::::::::", "matchCriteriaId": "5EA2AE41-BCD4-4F77-8883-D201C1AFD110", "versionEndExcluding": "10.0.9.6173", "vulnerable": true } ], "negate": false, "operator": "OR" }, { "cpeMatch": [ { "criteria": 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contiene una vulnerabilidad que permite a un atacante autenticado posteriormente leer un archivo arbitrario en el host remoto" } ], "id": "CVE-2021-20023", "lastModified": "2026-10-01T21:17:16.097", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N", "version": "2.0" }, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ], "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1" }, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2021-20023", "options": [ { "exploitation": "active" }, { "automatable": "yes" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2026-08-12T03:55:24.717669Z", "version": "2.0.3" } } ] }, "published": "2021-04-20T12:15:12.587", "references": [ { "source": "PSIRT@sonicwall.com", "tags": [ "Vendor Advisory" ], "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Vendor Advisory" ], "url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010" }, { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": [ "US Government Resource" ], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023" } ], "sourceIdentifier": "PSIRT@sonicwall.com", "vulnStatus": "Analyzed", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-22" } ], "source": "PSIRT@sonicwall.com", "type": "Secondary" }, { "description": [ { "lang": "en", "value": "CWE-22" } ], "source": "nvd@nist.gov", "type": "Primary" } ] } }	—
Vendor project vendor_project	CISA Known Exploited Vulnerabilities	SonicWall receipt Source CISA Known Exploited Vulnerabilities Its words `SonicWall` Read by `field:vendorProject` Said since 2026-09-28 11:44 UTC Last answered 2026-10-04 15:15 UTC What the source handed over { "cveID": "CVE-2021-20023", "cwes": "CWE-22", "dateAdded": "2021-11-03", "dueDate": "2021-11-17", "forensicTriage": "No", "knownRansomwareCampaignUse": "Known", "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-20023", "product": "SonicWall Email Security", "requiredAction": "Apply updates per vendor instructions.", "shortDescription": "SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation.", "vendorProject": "SonicWall", "vulnerabilityName": "SonicWall Email Security Path Traversal Vulnerability" }	—

vulnerability

SonicWall Email Security Path Traversal Vulnerability zetlyn/cve-kev · 2021-11-03	cwes CWE-22 due_date 2021-11-17 exploited yes forensic_triage false known_ransomware_campaign_use Known product SonicWall Email Security vendor_project SonicWall
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host. zetlyn/cve-nvd · 2021-04-20	cvss 4.9 product Email Security status Analyzed vendor SonicWall	source