HOMEVULNERABILITIESCVE-2021-32055
CRITICAL

CVE-2021-32055

CWE-125Published: May 5, 2021· Updated: Jun 17, 2026

9.1
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-32055 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

mutt1 product(s)
mutt
neomutt1 product(s)
neomutt
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dc
PATCHhttps://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5
PATCHhttps://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dc
PATCHhttps://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5
ADVISORYhttp://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.html
ADVISORYhttps://security.gentoo.org/glsa/202105-05
ADVISORYhttp://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.html
ADVISORYhttps://security.gentoo.org/glsa/202105-05

All References (8)

→
http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.htmlMailing List · Vendor Advisory
→
https://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dcPatch · Third Party Advisory
→
https://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5Patch · Third Party Advisory
→
https://security.gentoo.org/glsa/202105-05Third Party Advisory
→
http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.htmlMailing List · Vendor Advisory
→
https://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dcPatch · Third Party Advisory
→
https://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5Patch · Third Party Advisory
→
https://security.gentoo.org/glsa/202105-05Third Party Advisory

Quick Facts

CVE IDCVE-2021-32055
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-125
CISA KEVNo
Affected2 vendor(s)
PublishedMay 5, 2021

Related CVEs (CWE-125)

CVE-2017-14451
10.0
CVE-2021-41556
10.0
CVE-2013-0767
10.0
CVE-2009-2523
10.0
CVE-2021-21777
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-32055 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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