SMTP Client Vulnerability in Fetchmail Software by Fetchmail
CVE-2025-61962

5.9MEDIUM

Key Information:

Vendor

Fetchmail

Status
Fetchmail
Vendor
CVE Published:
4 October 2025

What is CVE-2025-61962?

An issue in Fetchmail versions before 6.5.6 can cause the SMTP client to crash during the authentication process when it receives a 334 status code in a malformed context. This vulnerability poses risks to system stability and security, necessitating an urgent update to prevent potential disruptions.

Affected Version(s)

fetchmail 5.9.9 < 6.5.6

References

https://www.openwall.com/lists/oss-security/2025/10/03/2
https://www.fetchmail.info/fetchmail-SA-2025-01.txt
https://gitlab.com/fetchmail/fetchmail/-/commit/4c3cebfa4...

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-61962 : SMTP Client Vulnerability in Fetchmail Software by Fetchmail