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 services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
72
EG Risk 72/100CISA 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
Severity98% × 45%
Exploitation58% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
58%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 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

November 2, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Oct 3, 2026
⚠️ Active exploitation confirmed. Patch available. 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(5)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+1
  • every version up to 5.10.84-1: fixed in 5.10.84-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.14.16-1: fixed in 5.14.16-1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(7)

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 5× in last 7d / 25× 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 148 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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 (99th percentile of EPSS-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?
A fix for CVE-2021-43267 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-43267 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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