CVE-2025-61962 Denial of service in fetchmail
A malformed SMTP response during authentication can crash the fetchmail client, causing a denial of service for email retrieval services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-61962?
CVE-2025-61962 is a medium-severity denial of service vulnerability in fetchmail, published on 4 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In fetchmail before 6.5.6, the SMTP client can crash when authenticating upon receiving a 334 status code in a malformed context.
Weakness: CWE-142
Which versions are affected by CVE-2025-61962?
Linux distribution packages (10)
fetchmail SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 6.4.22-150600.35.3.1 |
fetchmail SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 6.4.22-150600.35.3.1 |
fetchmail SUSE:Linux Enterprise Module for Desktop Applications 15 SP6 | All versions | 6.4.22-150600.35.3.1 |
fetchmail SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | All versions | 6.4.22-150600.35.3.1 |
fetchmail SUSE:Linux Enterprise Server 16.0 | All versions | 6.5.2-160000.3.1 |
fetchmail SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 6.3.26-13.21.1 |
fetchmail SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 6.5.2-160000.3.1 |
fetchmail openSUSE:Leap 15.6 | All versions | 6.4.22-150600.35.3.1 |
fetchmail openSUSE:Leap 16.0 | All versions | 6.5.2-160000.3.1 |
fetchmail openSUSE:Tumbleweed | All versions | 6.5.6-1.1 |
How do I fix CVE-2025-61962?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-61962 being exploited?
There is no known exploitation of CVE-2025-61962 in the wild and no public exploit code.
Sources
Also known as AZL-68127, AZL-68183, DEBIAN-CVE-2025-61962, GHSA-q9v7-qrhr-3q9v, MGASA-2025-0238, OESA-2025-2423 and 12 more.