Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
cve CVE-2026-83997 1 source, 1 claim · Watch
NVD writes:
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network. the claim
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network. the claim
- Severity
- HIGH NVD
- CVSS
- 8.1 NVD
- Fixed in
- 10.0.19044.7725, 10.0.19045.7725, 10.0.22631.7582, 10.0.26100.9445, 10.0.26200.9445, 10.0.28000.2954, 10.0.20348.5622, 10.0.26100.33438 NVD
- Vendor
- Microsoft NVD
- Product
- Windows 10 Version 21H2 NVD
- CWE
- CWE-416 NVD
How far exploitation has got
- No public code known
- Proof of concept
- Proof of concept, verified
- A Metasploit module
- Exploited in the wild
- Used in ransomware campaigns
Timeline
| 2026-09-08 | first spoke of it: Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network. | NVD |
What it is to other things
| affects | microsoft/windows_10_21h2 NVD |
| affects | microsoft/windows_10_22h2 NVD |
| affects | microsoft/windows_11_23h2 NVD |
| affects | microsoft/windows_11_24h2 NVD |
| affects | microsoft/windows_11_25h2 NVD |
| affects | microsoft/windows_11_26h1 NVD |
| affects | microsoft/windows_server_2022 NVD |
| affects | microsoft/windows_server_2025 NVD |
| made_by | microsoft NVD |
In words only, so not counted until a person confirms one:
| affects | microsoft/windows_10_version_21h2NVD says “Microsoft · Windows 10 Version 21H2” |
Every value, with what each source said and its receipt
| Property | Source | Said | Means here | ||||
|---|---|---|---|---|---|---|---|
| Automatable automatable | NVD | no At least one of those steps needs a person. receipt
What the source handed over{
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} | — | ||||
| CVSS cvss | NVD | 8.1receipt
What the source handed over{
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} | — | ||||
| CVSS vector cvss_vector | NVD | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hreceipt
What the source handed over{
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} | — | ||||
| CWE cwe | NVD | CWE-416receipt
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} | — | ||||
| Exploitation exploitation | NVD | none No evidence of exploitation, and no public proof of concept. receipt
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| Fixed in fixed_in | NVD | 10.0.19044.7725, 10.0.19045.7725, 10.0.22631.7582, 10.0.26100.9445, 10.0.26200.9445, 10.0.28000.2954, 10.0.20348.5622, 10.0.26100.33438receipt
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} | — | ||||
| Product product | NVD | Windows 10 Version 21H2receipt
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| Severity severity | NVD | HIGH From 7.0 to 8.9. receipt
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| Status status | NVD | Analyzedreceipt
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| Technical impact technical_impact | NVD | total The attacker gains full control of the component, or all of its information. receipt
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| Vendor vendor | NVD | Microsoftreceipt
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"role": "CISA Coordinator",
"timestamp": "2026-09-11T20:48:01.334595Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-08T18:21:10.530",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83997"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "secure@microsoft.com",
"type": "Secondary"
}
]
}
} | — |
Every claim, by kind
vulnerability
| Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network. zetlyn/cve-nvd · 2026-09-08 | automatable no cvss 8.1 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H cwe CWE-416 exploitation none fixed_in 10.0.19044.7725, 10.0.19045.7725, 10.0.22631.7582, 10.0.26100.9445, 10.0.26200.9445, 10.0.28000.2954, 10.0.20348.5622, 10.0.26100.33438 product Windows 10 Version 21H2 severity HIGH status Analyzed technical_impact total vendor Microsoft | source |