CVE-2021-43267

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 58%
CISA-KEV: Not listedEPSS PROB: 58%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
72(Track*)
EG Risk 72/100SSVC: Track*

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
Severity98% × 45%
Exploitation58% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
58%
EPSS %ILE
99%
KEV
Not listed

Published

November 2, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Aug 21, 2026
⚠️ Active exploitation confirmed. Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

[SECURITY] Fedora 34 Update: kernel-5.14.16-201.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVWL7HZV5T5OEKJPO2D67RMFMKBBXGGB/
github_commit

commit fa40d9734a57 (torvalds/linux)

Fix landed in torvalds/linux commit fa40d9734a57 — awaiting tagged release

https://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0
generic🔴 Active Exploitation
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
generic

oss-security - CVE-2022-0435: Remote Stack Overflow in Linux Kernel TIPC Module since 4.8 (net/tipc)

http://www.openwall.com/lists/oss-security/2022/02/10/1
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20211125-0002/
generic

[SECURITY] Fedora 35 Update: kernel-5.14.16-301.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDEW4APTYKJK365HC2JZIVXYUV7ZRN7/

Vendor Advisories for CVE-2021-43267(4)

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

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-oem-5.14-headers-5.14.0-1008 (5.14.0-1008.8) @ focal2026-05-26ubuntu
ubuntulinux-oem-20.04b (5.10.0.1053.55) @ focal2026-05-26ubuntu
ubuntulinux-lowlatency-hwe-20.04-edge (5.11.0.44.44) @ hirsute2026-05-26ubuntu
ubuntulinux-image-5.13.0-1026-oem (5.13.0-1026.32) @ focal2026-05-26ubuntu
redhatredhat-virtualization-host-0:4.4.9-202111172338_8.52021-11-19redhat
redhatkpatch-patch2021-11-15redhat
redhatkernel-0:4.18.0-348.2.1.el8_52021-11-15redhat
redhatkernel-rt-0:4.18.0-305.28.1.rt7.100.el8_42021-11-15redhat
redhatkernel-0:4.18.0-305.28.1.el8_42021-11-15redhat
redhatkernel-rt-0:4.18.0-348.2.1.rt7.132.el8_52021-11-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+15.10.84-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.16-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.16-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.16-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 23× 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 111 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCzzhacked/CVE-2021-43267
    First seen Nov 26, 2021

    Local PoC exploit for CVE-2021-43267 (Linux TIPC)

    Open source ↗

Frequently asked(5)

What is CVE-2021-43267?
CVE-2021-43267 is a critical vulnerability published on November 2, 2021. An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.
When was CVE-2021-43267 disclosed?
CVE-2021-43267 was first published in the National Vulnerability Database on November 2, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-43267 actively exploited?
CVE-2021-43267 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58% probability of exploitation in the next 30 days, which ranks it in the top 1.0% of all scored CVEs.
What is the CVSS score of CVE-2021-43267?
CVE-2021-43267 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-43267?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43267, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-43267

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