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CVE-2021-36081

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

7.8 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.89%Up 0.1 points since Jul 1, 2021
90%50%10%1%

What each source reports

NVD Score used 7.8

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

Record
CVE-2021-36081
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-416
Updated
2026-11-02
CVE List No score

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

Record
CVE-2021-36081
Updated
2026-11-02
EUVDEUVD-2021-22714 No score

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

Record
EUVD-2021-22714
Updated
2026-11-03
GitHub AdvisoriesGHSA-5x29-fwcc-jm29 7.8

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

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

Record
GHSA-5x29-fwcc-jm29
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-416
Updated
2026-11-02
OSV 7.8

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

Record
CVE-2021-36081
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-36081 7.8

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

Record
DEBIAN-CVE-2021-36081
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-36081 7.8

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

Record
UBUNTU-CVE-2021-36081
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tesseract
Debian:12
 before 5.1.0-1
5.1.0-1
tesseract
Debian:13
 before 5.1.0-1
5.1.0-1
tesseract
Debian:14
 before 5.1.0-1
5.1.0-1
tesseract
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
4.1.0-14.1.0-24.1.1-14.1.1-24.1.1-2build14.1.1-2build24.1.1-2ubuntu0.1~esm1
 None known
tesseract
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
4.1.1-2.14.1.1-2.1build14.1.1-2.1ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-36081 is a high vulnerability (CVSS 7.8) in Tesseract-ocr Tesseract Ocr, published July 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.89%, the 59th percentile. Fixed in tesseract 5.1.0-1.

References

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