CVE-2021-32055 [Critical] | Out-of-bounds Read in Mutt

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-23	0.53%	0.36%	-0.18%
2	2025-11-21	0.78%	0.53%	-0.25%
3	2025-11-18	—	0.78%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-23

0.53%

0.36%

-0.18%

2025-11-21

0.78%

0.53%

-0.25%

2025-11-18

—

0.78%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.1	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.2	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.1

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.2

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

4.9

[email protected]

OS Trackers for CVE-2021-32055

vendor	priority	summary	link
`alpine`	critical	CVE-2021-32055: 2 source package rows (mutt, neomutt); 13 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 6.	https://security.alpinelinux.org/vuln/CVE-2021-32055
`debian`	not yet assigned	CVE-2021-32055 not yet assigned priority: Debian including 2 source packages (mutt, neomutt), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10.	https://security-tracker.debian.org/tracker/CVE-2021-32055
`gentoo`	low	CVE-2021-32055: 1 GLSA(s) (202105-05), 2 atom(s) (mail-client/mutt, mail-client/neomutt); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-32055
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2021-32055
`suse`	medium	CVE-2021-32055 severity moderate: SUSE including 18 source package names (mutt, mutt-2.0.7-2.2, …), 72 product×package rows across 41 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (41 product lines)): Known Not Affected 51, Fixed 21.	https://www.suse.com/security/cve/CVE-2021-32055/
`ubuntu`	low	CVE-2021-32055 low priority: Ubuntu including 2 source packages (mutt, neomutt), 30 status rows across 15 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, trusty, upstream, xenial): not-affected 14, ignored 10, released 5, DNE 1.	https://ubuntu.com/security/CVE-2021-32055

Affected software / configurations for CVE-2021-32055

Vendor	Product	Version	Raw CPE
mutt	mutt	>= 1.11.0, < 2.0.7	cpe:2.3:a:mutt:mutt::::::::
neomutt	neomutt	>= 20191025, <= 20210504	cpe:2.3:a:neomutt:neomutt::::::::

References for CVE-2021-32055

URL	Tags
http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20210503/000036.html	Mailing List Vendor Advisory
https://github.com/neomutt/neomutt/commit/fa1db5785e5cfd9d3cd27b7571b9fe268d2ec2dc	Patch Third Party Advisory
https://gitlab.com/muttmua/mutt/-/commit/7c4779ac24d2fb68a2a47b58c7904118f40965d5	Patch Third Party Advisory
https://security.gentoo.org/glsa/202105-05	Third Party Advisory

URL

CVE-2021-32055

Exploit prediction scoring system (EPSS) score for CVE-2021-32055

Common vulnerability scoring system (CVSS) metrics for CVE-2021-32055

Weakness enumeration for CVE-2021-32055

OS Trackers for CVE-2021-32055

Affected software / configurations for CVE-2021-32055

References for CVE-2021-32055