CVE-2021-3181

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory consumption, and the victim may then be unable to see email messages from other persons.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity65% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
86%
KEV
Not listed

Published

January 19, 2021

Last Modified

November 21, 2024

References (22)

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntumutt (1.9.4-3ubuntu0.5) @ bionic2026-05-26ubuntu
redhatmutt-5:2.0.7-1.el82021-11-09redhat

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

(6 across 6 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
mutt1.10.1-2.1, 1.10.1-2.1+deb10u1, 1.10.1-2.1+deb10u2, 1.10.1-2.1+deb10u3, 1.10.1-2.1+deb10u41.10.1-2.1+deb10u5—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
mutt1.7.2-1, 1.7.2-1+deb9u1, 1.7.2-1+deb9u2, 1.7.2-1+deb9u3, 1.7.2-1+deb9u41.7.2-1+deb9u5—

Weakness Classification(2)

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

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 31× 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 163 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2021-3181?
CVE-2021-3181 is a medium vulnerability published on January 19, 2021. rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory…
When was CVE-2021-3181 disclosed?
CVE-2021-3181 was first published in the National Vulnerability Database on January 19, 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-2021-3181 actively exploited?
CVE-2021-3181 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.2% of all scored CVEs.
What is the CVSS score of CVE-2021-3181?
CVE-2021-3181 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2021-3181?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3181, 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.

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