Input validation error in Fetchmail - CVE-2025-61962
Published: October 20, 2025
Vulnerability identifier: #VU117379
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-61962
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: fetchmail.berlios.de
Affected software:
Fetchmail
Fetchmail
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input during authentication. A remote attacker that controls SMTP server can send 334 status code response and crash the mail client.
How to mitigate CVE-2025-61962
Install updates from vendor's website.