Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.

cve CVE-2021-36081 1 source, 1 claim · Watch

NVD writes:
Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call. the claim

Severity: HIGH NVD
CVSS: 7.8 NVD
Vendor: n/a NVD
Product: n/a 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

2021-07-01

first spoke of it: Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.

NVD

What it is to other things

affects	linux/linux_kernel NVD
affects	tesseract-ocr/tesseract_ocr NVD
made_by	linux NVD
made_by	tesseract-ocr NVD

In words only, so not counted until a person confirms one:

made_by	`n_a` NVD says “n/a”
affects	`n_a/n_a` NVD says “n/a · n/a”

Every value, with what each source said and its receipt

Property Source Said Means here

CVSS

cvss

NVD

7.8

receipt

Source: NVD
Its words: 7.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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—

CVSS vector

cvss_vector

NVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2026-09-29 09:45 UTC	—

What the source handed over

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—

CWE

cwe

NVD

CWE-416

receipt

Source: NVD
Its words: CWE-416
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	CWE-416
2026-09-29 09:45 UTC	—

What the source handed over

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—

Product

product

NVD

n/a

receipt

Source: NVD
Its words: n/a
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	n/a
2026-09-29 09:45 UTC	—

What the source handed over

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        "type": "Primary"
      }
    ]
  }
}

—

Severity

severity

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	HIGH
2026-09-29 09:45 UTC	—

What the source handed over

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high

Status

status

NVD

Modified

receipt

Source: NVD
Its words: Modified
Read by: field:cve.vulnStatus
Said since: 2026-09-29 09:45 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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        "type": "Primary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

n/a

receipt

Source: NVD
Its words: n/a
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-09-29 17:49 UTC	n/a
2026-09-29 09:45 UTC	—

What the source handed over

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    "affected": [
      {
        "affectedData": [
          {
            "product": "n/a",
            "vendor": "n/a",
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        "tags": [
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    ],
    "sourceIdentifier": "cve@mitre.org",
    "vulnStatus": "Modified",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
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        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.

zetlyn/cve-nvd · 2021-07-01

cvss 7.8 cvss_vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H cwe CWE-416 product n/a severity HIGH status Modified vendor n/a

source