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NVD / CVE Program· CNA mitre

CVE-2021-32055: 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

Noroxi assessment

Priority: Monitor (action score 37/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 85% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: mutt (Debian:12) 2.0.5-4.1; neomutt (Debian:12) 20201127+dfsg.1-1.2; neomutt (openSUSE:Leap 15.4) 20220429-bp154.2.3.1.

Low priority for now. Upgrade to mutt (Debian:12) 2.0.5-4.1; neomutt (Debian:12) 20201127+dfsg.1-1.2; neomutt (openSUSE:Leap 15.4) 20220429-bp154.2.3.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 5, 2021
Updated
Jun 16, 2026
EPSS
2.5% · 85th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
muttmutt
neomuttneomutt

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mutt mutt1.11.0 and later · before 2.0.7
  • neomutt neomutt20191025 and later · up to 20210504 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12muttbefore 2.0.5-4.12.0.5-4.1
Debian:12neomuttbefore 20201127+dfsg.1-1.220201127+dfsg.1-1.2
openSUSE:Leap 15.4neomuttbefore 20220429-bp154.2.3.120220429-bp154.2.3.1
openSUSE:Tumbleweedneomuttbefore 20211029-1.120211029-1.1
SUSE:Package Hub 15 SP4neomuttbefore 20220429-bp154.2.3.120220429-bp154.2.3.1

Same product

mutt: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-14354An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    41Plan
  • CVE-2018-14362An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    40Plan
  • CVE-2018-14359An issue was discovered in Mutt before 1.10.1 and NeoMutt before 2018-07-16.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2020-28896Nov 23, 2020 · Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response
    22Monitor
  • ← EarlierCVE-2021-3181Jan 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
    27Monitor
  • Later →CVE-2022-1328Apr 14, 2022 · Buffer Overflow in uudecoder in Mutt affecting all versions starting from 0.94.13 before 2.2.3 allows read past end of input line
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:mutt2.0.5-4.1 · Debian:12Package registry (OSV)
debian:neomutt20201127+dfsg.1-1.2 · Debian:12Package registry (OSV)
opensuse:neomutt20220429-bp154.2.3.1 · openSUSE:Leap 15.4Package registry (OSV)
suse:neomutt20220429-bp154.2.3.1 · SUSE:Package Hub 15 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records