CVE-2021-36081

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.9% (57th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.9%
EPSS %ILE
57th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 1, 2021

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Patch available. Sources: github_commit.
github_commit Patch Available

commit e6f15621c2ab (tesseract-ocr/tesseract)

Patch available: tesseract-ocr/tesseract 5.0.0-alpha-20210401 (contains commit e6f15621c2ab)

https://github.com/tesseract-ocr/tesseract/commit/e6f15621c2ab2ecbfabf656942d8ef66f03b2d55
generic

oss-fuzz-vulns/vulns/tesseract-ocr/OSV-2021-211.yaml at main · google/oss-fuzz-vulns · GitHub

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/tesseract-ocr/OSV-2021-211.yaml
generic
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29698

Vendor Advisories for CVE-2021-36081(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
tesseract4.1.1-2.1 ... 5.5.0-1.1 (13 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
tesseract—5.1.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
tesseract—5.1.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
tesseract—5.1.0-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 35× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 185 total refreshes for this CVE.

  1. 2026-10-04 00:19 UTCOSV refresh
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-10-01 19:46 UTCEPSS rescore
  4. 2026-09-30 15:38 UTCEG score recompute
  5. 2026-09-30 15:00 UTCEPSS rescore
  6. 2026-09-29 15:15 UTCEPSS rescore
  7. 2026-09-28 13:47 UTCEPSS rescore
  8. 2026-09-27 13:41 UTCEPSS rescore
  9. 2026-09-26 15:54 UTCEPSS rescore
  10. 2026-09-26 00:21 UTCEPSS rescore
  11. 2026-09-24 14:00 UTCEPSS rescore
  12. 2026-09-23 13:44 UTCEPSS rescore
  13. 2026-09-22 14:44 UTCEPSS rescore
  14. 2026-09-21 20:28 UTCEPSS rescore
  15. 2026-09-21 20:28 UTCEPSS rescore
  16. 2026-09-20 20:12 UTCEPSS rescore
  17. 2026-09-19 15:38 UTCEPSS rescore
  18. 2026-09-18 19:23 UTCEPSS rescore
  19. 2026-09-17 19:23 UTCEPSS rescore
  20. 2026-09-17 19:23 UTCEPSS rescore
  21. 2026-09-16 14:05 UTCEPSS rescore
  22. 2026-09-16 14:05 UTCEPSS rescore
  23. 2026-09-15 03:06 UTCEPSS rescore
  24. 2026-09-14 14:33 UTCEG score recompute
  25. 2026-09-14 14:33 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 16:43 UTCEPSS rescore
  2. 2026-09-12 14:57 UTCEPSS rescore
  3. 2026-09-11 14:49 UTCEPSS rescore
  4. 2026-09-11 09:33 UTCEPSS rescore
  5. 2026-09-08 21:56 UTCEPSS rescore
  6. 2026-09-07 15:58 UTCEPSS rescore
  7. 2026-09-06 13:45 UTCEPSS rescore
  8. 2026-09-06 13:45 UTCEPSS rescore
  9. 2026-09-06 13:39 UTCOSV refresh
  10. 2026-09-05 15:25 UTCEPSS rescore
  11. 2026-09-04 13:57 UTCEPSS rescore
  12. 2026-09-04 05:03 UTCEPSS rescore
  13. 2026-09-02 14:08 UTCEPSS rescore
  14. 2026-09-01 13:50 UTCEPSS rescore
  15. 2026-09-01 03:32 UTCEPSS rescore
  16. 2026-08-30 19:14 UTCEPSS rescore
  17. 2026-08-30 01:19 UTCEPSS rescore
  18. 2026-08-30 01:19 UTCEPSS rescore
  19. 2026-08-28 21:37 UTCEPSS rescore
  20. 2026-08-27 14:22 UTCEPSS rescore
  21. 2026-08-26 14:42 UTCEPSS rescore
  22. 2026-08-25 13:46 UTCEPSS rescore
  23. 2026-08-24 14:13 UTCEPSS rescore
  24. 2026-08-23 00:16 UTCEPSS rescore
  25. 2026-08-21 23:46 UTCEPSS rescore
  26. 2026-08-20 22:52 UTCEPSS rescore
  27. 2026-08-20 00:15 UTCOSV refresh
  28. 2026-08-19 17:01 UTCEPSS rescore
  29. 2026-08-18 13:45 UTCEPSS rescore
  30. 2026-08-17 13:44 UTCEPSS rescore
  31. 2026-08-16 14:53 UTCEPSS rescore
  32. 2026-08-16 02:11 UTCEPSS rescore
  33. 2026-08-16 02:11 UTCEPSS rescore
  34. 2026-08-15 01:27 UTCEPSS rescore
  35. 2026-08-13 21:57 UTCEPSS rescore
  36. 2026-08-12 13:48 UTCEPSS rescore
  37. 2026-08-11 13:38 UTCEPSS rescore
  38. 2026-08-09 13:44 UTCEPSS rescore
  39. 2026-08-08 16:33 UTCEPSS rescore
  40. 2026-08-07 16:24 UTCEPSS rescore
  41. 2026-08-06 13:43 UTCEPSS rescore
  42. 2026-08-05 19:14 UTCEPSS rescore
  43. 2026-08-04 19:18 UTCOSV refresh
  44. 2026-08-04 15:06 UTCEPSS rescore
  45. 2026-08-04 10:34 UTCEPSS rescore
  46. 2026-08-03 10:33 UTCEPSS rescore
  47. 2026-08-02 02:24 UTCEPSS rescore
  48. 2026-08-02 02:24 UTCEPSS rescore
  49. 2026-08-01 04:13 UTCEPSS rescore
  50. 2026-07-30 16:25 UTCEPSS rescore
  51. 2026-07-30 01:28 UTCEPSS rescore
  52. 2026-07-28 15:33 UTCEPSS rescore
  53. 2026-07-26 14:52 UTCEPSS rescore
  54. 2026-07-26 14:52 UTCEPSS rescore
  55. 2026-07-25 14:15 UTCEPSS rescore
  56. 2026-07-24 14:15 UTCEPSS rescore
  57. 2026-07-23 14:16 UTCEPSS rescore
  58. 2026-07-23 14:16 UTCEPSS rescore
  59. 2026-07-23 02:02 UTCEG score recompute
  60. 2026-07-22 22:49 UTCEG score recompute
  61. 2026-07-22 14:06 UTCEPSS rescore
  62. 2026-07-22 14:06 UTCEPSS rescore
  63. 2026-07-21 15:22 UTCEPSS rescore
  64. 2026-07-21 15:22 UTCEPSS rescore
  65. 2026-07-20 17:05 UTCEPSS rescore
  66. 2026-07-19 14:29 UTCEPSS rescore
  67. 2026-07-19 14:29 UTCEPSS rescore
  68. 2026-07-19 02:27 UTCEPSS rescore
  69. 2026-07-18 17:29 UTCOSV refresh
  70. 2026-07-18 10:02 UTCEPSS rescore
  71. 2026-07-18 10:02 UTCEPSS rescore
  72. 2026-07-16 17:00 UTCEPSS rescore
  73. 2026-07-16 17:00 UTCEPSS rescore
  74. 2026-07-15 16:55 UTCEPSS rescore
  75. 2026-07-15 01:58 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

3 shown

Debian:11:tesseract · Debian:12:tesseract

Frequently asked(5)

What is CVE-2021-36081?
CVE-2021-36081 is a high vulnerability published on July 1, 2021. Tesseract OCR 5.0.0-alpha-20201231 has a oneellconflict use-after-free during a strpbrk call.
When was CVE-2021-36081 disclosed?
CVE-2021-36081 was first published on July 1, 2021, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-36081 actively exploited?
CVE-2021-36081 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (57th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-36081?
CVE-2021-36081 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-36081?
A fix for CVE-2021-36081 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-36081 are linked in the Vendor Advisories panel on this page.

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