CVE-2025-61962

Publication date 4 October 2025

Last updated 23 October 2025

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

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

Status

Show unmaintained releases

Package	Ubuntu Release	Status
fetchmail	25.10 questing	Fixed 6.5.4-0ubuntu2
	25.04 plucky	Fixed 6.4.39-1ubuntu0.1
	24.04 LTS noble	Fixed 6.4.38-1ubuntu4.1
	22.04 LTS jammy	Fixed 6.4.27-1ubuntu0.1
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
fetchmail	Upstream: 4c3cebf

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7838-1
fetchmail vulnerability
23 October 2025

Other references