CVE-2021-32055

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 2.6%, top 17% of all CVEs by exploit prediction. 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
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

Mutt 1.11.0 through 2.0.x before 2.0.7 (and NeoMutt 2019-10-25 through 2021-05-04) has a $imap_qresync issue in which imap/util.c has an out-of-bounds read in situations where an IMAP sequence set ends with a comma. NOTE: the $imap_qresync setting for QRESYNC is not enabled by default.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

May 5, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 19, 2026
Patch available. Sources: github_commit.
generic

Mutt, NeoMutt: Denial of service (GLSA 202105-05) — Gentoo security

https://security.gentoo.org/glsa/202105-05
generic

Fix seqset iterator when it ends in a comma. (7c4779ac) · Commits · Mutt Project / mutt · GitLab

https://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5
github_commit Patch Available

commit fa1db5785e5c (neomutt/neomutt)

Patch available: neomutt/neomutt 20211029 (contains commit fa1db5785e5c)

https://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dc
generic

mutt 2.0.7 released

http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.html

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntumutt (2.1.4-1ubuntu1.1) @ jammy2026-05-26ubuntu
ubuntuneomutt (20231103+dfsg1-1ubuntu0.1~esm1) @ noble2026-05-26ubuntu

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

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-4.1—
neomutt—20201127+dfsg.1-1.2—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-4.1—
neomutt—20201127+dfsg.1-1.2—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-4.1—
neomutt—20201127+dfsg.1-1.2—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
mutt—2.0.5-4.1—
neomutt—20201127+dfsg.1-1.2—

Weakness Classification(1)

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

All Vendor Advisories

(3)

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 8× in last 7d / 32× 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 169 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-32055?
CVE-2021-32055 is a critical vulnerability published on May 5, 2021. Mutt 1.11.0 through 2.0.x before 2.0.7 (and NeoMutt 2019-10-25 through 2021-05-04) has a $imapqresync issue in which imap/util.c has an out-of-bounds read in situations where an IMAP sequence set ends with a comma. NOTE: the $imapqresync setting for QRESYNC is not enabled by default.
When was CVE-2021-32055 disclosed?
CVE-2021-32055 was first published in the National Vulnerability Database on May 5, 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-2021-32055 actively exploited?
CVE-2021-32055 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 15.7% of all scored CVEs.
What is the CVSS score of CVE-2021-32055?
CVE-2021-32055 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-32055?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32055, 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-2021-32055

Explore →

Is Your Infrastructure Affected by CVE-2021-32055?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs