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Fencer Intel
medium 5.9

CVE-2025-61962 json

In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.

published last yr. modified 21d ago also EUVD-2025-32411

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.

Patch / fix

  • fetchmail fetchmail 6.5.6
  • fetchmail Debian 14 6.5.6-1

debian advisories DEBIAN-CVE-2025-61962

  • fetchmail Ubuntu 22.04 LTS 6.4.27-1ubuntu0.1
  • fetchmail Ubuntu 24.04 LTS 6.4.38-1ubuntu4.1
  • fetchmail Ubuntu 26.04 LTS, Ubuntu 25.10 6.5.4-0ubuntu2

ubuntu advisories UBUNTU-CVE-2025-61962

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • fetchmail SLES for SAP applications 16.0, SLES 16.0 6.5.2-160000.3.1
  • fetchmail SLE Module for Desktop Applications 15 SP7, SLE Module for Desktop Applications 15 SP6, SLE Module for Basesystem 15 SP7 +2 more 6.4.22-150600.35.3.1
  • fetchmail SLES LTSS Extended Security 12 SP5 6.3.26-13.21.1

suse advisories SUSE-SU-2026:20935-1SUSE-SU-2025:3966-1SUSE-SU-2025:3845-1

  • fetchmail openSUSE Leap 16.0 6.5.2-160000.3.1
  • fetchmail openSUSE Tumbleweed 6.5.6-1.1

opensuse advisories openSUSE-SU-2026:20432-1openSUSE-SU-2025:15653-1

  • fetchmail Alpine 3.24, Alpine 3.23 6.5.6-r0

alpine advisories ALPINE-CVE-2025-61962

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2025-61962 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-61962 updated cvss 5.3

fetchmail: Fetchmail denial of service

  • Red Hat Enterprise Linux 6 fetchmail Red Hat Enterprise Linux 7 fetchmail Red Hat Enterprise Linux 8 fetchmail Red Hat Enterprise Linux 9 fetchmail Red Hat Enterprise Linux 10 fetchmail
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • fetchmail fetchmail

Classification

Weakness
  • CWE-142 Improper Neutralization of Value Delimiters

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.