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

CVE-2025-61962

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

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

MEDIUM · CVSS 5.9 EPSS 0.00061
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-142Improper Neutralization of Value Delimiters
▣

Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Oct 2025 · 03:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

6
suse-csafopenSUSE-SU-2026:20432-1
suse-csafSUSE-SU-2026:20935-1
suse-csafSUSE-SU-2025:3966-1
suse-csafSUSE-SU-2025:3845-1
usnUSN-7838-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://gitlab.com/fetchmail/fetchmail/-/commit/4c3cebfa4e659fb778ca2cae0ccb3f69201609a8
https://www.fetchmail.info/fetchmail-SA-2025-01.txt
https://www.openwall.com/lists/oss-security/2025/10/03/2
http://www.openwall.com/lists/oss-security/2025/10/04/3
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