CVE-2021-44142

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because EPSS predicts 74% probability of exploitation within the next 30 days (top 0.6% of all CVEs). NVD baseline CVSS 8.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
9.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 73%
CISA-KEV: Not listedEPSS PROB: 73%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver." Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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
Severity90% × 45%
Exploitation74% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
73%
EPSS %ILE
99%
KEV
Not listed

Published

February 21, 2022

Last Modified

April 23, 2025

Advisory Details (6)

Auto-updated Aug 7, 2026
No patch confirmed yet. Sources: cert.
generic

Samba - Security Announcement Archive

https://www.samba.org/samba/security/CVE-2021-44142.html
cert

VU#119678 - Samba vfs_fruit module insecurely handles extended file attributes

https://www.kb.cert.org/vuls/id/119678
generic

Samba: Multiple Vulnerabilities (GLSA 202309-06) — Gentoo security

https://security.gentoo.org/glsa/202309-06
cert

VU#119678 - Samba vfs_fruit module insecurely handles extended file attributes

https://kb.cert.org/vuls/id/119678
generic

14914 – (CVE-2021-44142) CVE-2021-44142 [SECURITY] Out-of-Bound Read/Write on Samba vfs_fruit module

https://bugzilla.samba.org/show_bug.cgi?id=14914
generic

Zero Day Initiative — CVE-2021-44142: Details on a Samba Code Execution Bug Demonstrated at Pwn2Own Austin

https://www.zerodayinitiative.com/blog/2022/2/1/cve-2021-44142-details-on-a-samba-code-execution-bug-demonstrated-at-pwn2own-austin

Vendor Advisories for CVE-2021-44142(7)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.3.11+dfsg-0ubuntu0.16.04.34+esm1) @ xenial2026-05-23ubuntu
ubuntupython3-samba (2:4.13.17~dfsg-0ubuntu0.21.10.1) @ impish2026-05-23ubuntu
ubunturegistry-tools (2:4.7.6+dfsg~ubuntu-0ubuntu2.28) @ bionic2026-05-23ubuntu
redhatsamba-0:4.9.1-12.el7_72022-02-23redhat
redhatsamba-0:4.8.3-7.el7_62022-02-23redhat
redhatsamba-0:4.14.5-206.el8rhgs2022-02-07redhat
redhatsamba-0:4.11.6-116.el7rhgs2022-02-07redhat
redhatsamba-0:4.11.2-19.el8_22022-01-31redhat
redhatsamba-0:4.13.3-9.el8_42022-01-31redhat
redhatsamba-0:4.10.16-18.el7_92022-01-31redhat
redhatsamba-0:4.14.5-9.el8_52022-01-31redhat
redhatsamba-0:4.10.4-103.el8_12022-01-31redhat

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

(9 across 9 ecosystems)
Alpine:v3.13(1)
PackageVulnerable rangeFixed inDependents
samba—4.13.17-r0—
Alpine:v3.14(1)
PackageVulnerable rangeFixed inDependents
samba—4.14.12-r0—
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
samba—4.15.12-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
samba—4.15.12-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
samba2:4.9.5+dfsg-5, 2:4.9.5+dfsg-5+deb10u1, 2:4.9.5+dfsg-5+deb10u22:4.9.5+dfsg-5+deb10u3—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba2:4.13.13+dfsg-1~deb11u1, 2:4.13.13+dfsg-1~deb11u2, 2:4.13.5+dfsg-22:4.13.13+dfsg-1~deb11u3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.16.0+dfsg-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.16.0+dfsg-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba—2:4.16.0+dfsg-2—

Weakness Classification(2)

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

Additional Vendor Advisories

(6)

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 6× in last 7d / 21× 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 123 total refreshes for this CVE.

  1. 2026-09-20 04:35 UTCOSV refresh
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
  4. 2026-09-17 19:23 UTCEPSS rescore
  5. 2026-09-16 14:05 UTCEPSS rescore
  6. 2026-09-15 03:06 UTCEPSS rescore
  7. 2026-09-12 14:57 UTCEPSS rescore
  8. 2026-09-11 09:33 UTCEPSS rescore
  9. 2026-09-08 21:56 UTCEPSS rescore
  10. 2026-09-06 13:45 UTCEPSS rescore
  11. 2026-09-05 15:25 UTCEPSS rescore
  12. 2026-09-04 13:57 UTCEPSS rescore
  13. 2026-09-02 14:09 UTCEPSS rescore
  14. 2026-09-01 13:50 UTCEPSS rescore
  15. 2026-09-01 08:23 UTCOSV refresh
  16. 2026-08-30 19:14 UTCEPSS rescore
  17. 2026-08-30 19:14 UTCEPSS rescore
  18. 2026-08-28 21:37 UTCEPSS rescore
  19. 2026-08-26 14:43 UTCEPSS rescore
  20. 2026-08-24 14:13 UTCEPSS rescore
  21. 2026-08-23 00:16 UTCEPSS rescore
  22. 2026-08-20 22:52 UTCEPSS rescore
  23. 2026-08-20 22:52 UTCEPSS rescore
  24. 2026-08-19 17:01 UTCEPSS rescore
  25. 2026-08-16 14:53 UTCEPSS rescore
Show 75 more
  1. 2026-08-16 02:11 UTCEPSS rescore
  2. 2026-08-15 07:37 UTCOSV refresh
  3. 2026-08-15 01:27 UTCEPSS rescore
  4. 2026-08-13 21:57 UTCEPSS rescore
  5. 2026-08-12 13:48 UTCEPSS rescore
  6. 2026-08-11 13:38 UTCEPSS rescore
  7. 2026-08-09 13:44 UTCEPSS rescore
  8. 2026-08-07 16:24 UTCEPSS rescore
  9. 2026-08-05 19:14 UTCEPSS rescore
  10. 2026-08-04 10:34 UTCEPSS rescore
  11. 2026-08-03 10:33 UTCEPSS rescore
  12. 2026-07-30 19:50 UTCOSV refresh
  13. 2026-07-30 16:25 UTCEPSS rescore
  14. 2026-07-30 01:28 UTCEPSS rescore
  15. 2026-07-28 15:33 UTCEPSS rescore
  16. 2026-07-25 14:15 UTCEPSS rescore
  17. 2026-07-24 14:15 UTCEPSS rescore
  18. 2026-07-23 02:05 UTCEG score recompute▲ 0.20
  19. 2026-07-22 22:51 UTCEG score recompute
  20. 2026-07-22 14:06 UTCEPSS rescore
  21. 2026-07-21 15:22 UTCEPSS rescore
  22. 2026-07-21 15:22 UTCEPSS rescore
  23. 2026-07-20 17:05 UTCEPSS rescore
  24. 2026-07-19 14:29 UTCEPSS rescore
  25. 2026-07-18 10:02 UTCEPSS rescore
  26. 2026-07-18 10:02 UTCEPSS rescore
  27. 2026-07-16 17:00 UTCEPSS rescore
  28. 2026-07-16 17:00 UTCEPSS rescore
  29. 2026-07-15 16:55 UTCEPSS rescore
  30. 2026-07-15 16:55 UTCEPSS rescore
  31. 2026-07-13 06:11 UTCEPSS rescore
  32. 2026-07-13 06:11 UTCEPSS rescore
  33. 2026-07-13 04:37 UTCOSV refresh
  34. 2026-07-11 08:25 UTCEPSS rescore
  35. 2026-07-11 08:25 UTCEPSS rescore
  36. 2026-07-09 19:07 UTCEPSS rescore
  37. 2026-07-06 02:21 UTCEPSS rescore
  38. 2026-07-06 02:21 UTCEPSS rescore
  39. 2026-07-02 16:57 UTCEPSS rescore
  40. 2026-07-01 15:04 UTCEPSS rescore
  41. 2026-06-30 23:20 UTCEPSS rescore
  42. 2026-06-30 23:20 UTCEPSS rescore
  43. 2026-06-28 14:05 UTCEPSS rescore
  44. 2026-06-27 03:06 UTCEPSS rescore
  45. 2026-06-27 03:06 UTCEPSS rescore
  46. 2026-06-25 13:48 UTCEPSS rescore
  47. 2026-06-25 13:48 UTCEPSS rescore
  48. 2026-06-24 15:01 UTCOSV refresh
  49. 2026-06-24 14:03 UTCEPSS rescore
  50. 2026-06-24 14:03 UTCEPSS rescore
  51. 2026-06-23 21:31 UTCEPSS rescore
  52. 2026-06-23 21:31 UTCEPSS rescore
  53. 2026-06-21 14:55 UTCEPSS rescore
  54. 2026-06-18 17:51 UTCEPSS rescore
  55. 2026-06-18 17:51 UTCEPSS rescore
  56. 2026-06-17 17:51 UTCEPSS rescore
  57. 2026-06-17 17:51 UTCEPSS rescore
  58. 2026-06-17 17:51 UTCEPSS rescore
  59. 2026-06-15 17:46 UTCEPSS rescore
  60. 2026-06-13 22:58 UTCEPSS rescore
  61. 2026-06-13 22:58 UTCEPSS rescore
  62. 2026-06-12 23:10 UTCEPSS rescore
  63. 2026-06-11 13:58 UTCEPSS rescore
  64. 2026-06-11 13:58 UTCEPSS rescore
  65. 2026-06-10 22:16 UTCEPSS rescore
  66. 2026-06-10 22:16 UTCEPSS rescore
  67. 2026-06-10 13:20 UTCEPSS rescore
  68. 2026-06-08 14:15 UTCEPSS rescore
  69. 2026-06-08 14:15 UTCEPSS rescore
  70. 2026-06-07 18:46 UTCOSV refresh
  71. 2026-06-07 15:23 UTCEPSS rescore
  72. 2026-06-07 15:23 UTCEPSS rescore
  73. 2026-06-06 13:46 UTCEPSS rescore
  74. 2026-06-06 13:46 UTCEPSS rescore
  75. 2026-06-05 22:45 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCNxvh1337/CVE-2021-44142-vulnerable-lab
    First seen Oct 27, 2025

    CVE-2021-44142 vulnerable lab

    Open source ↗
  • GitHub PoChorizon3ai/CVE-2021-44142
    First seen Mar 29, 2022
    Open source ↗

Related CVEs(same vendor + same CWE)

Same vendor

2 shown

ubuntu:USN-5260-1

Frequently asked(5)

What is CVE-2021-44142?
CVE-2021-44142 is a critical vulnerability published on February 21, 2022. The Samba vfsfruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver." Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfsfruit configured allow out-of-bounds heap read and…
When was CVE-2021-44142 disclosed?
CVE-2021-44142 was first published in the National Vulnerability Database on February 21, 2022, with the most recent update on April 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-44142 actively exploited?
CVE-2021-44142 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
What is the CVSS score of CVE-2021-44142?
CVE-2021-44142 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2021-44142?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-44142, 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-2021-44142

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