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Ubuntu 25.04: Fetchmail Important Crash Risk DoS CVE-2025-61962

ubuntu
Calendar Grey October 23, 2025
Dist Ubuntu Esm H88
Fetchmail crash risk from malicious traffic. Important update required on Ubuntu 22.04, 24.04, and 25.04 LTS.
fetchmail could be made to crash if it received specially crafted network traffic.

Summary

fetchmail could be made to crash if it received specially crafted network

traffic.

Software Description:

- fetchmail: SSL enabled POP3, APOP, IMAP mail gatherer/forwarder

Details:

It was discovered that the fetchmail SMTP client incorrectly handled

certain status code messages. An attacker controlling a malicious server

could possibly use this issue to cause fetchmail to crash, resulting in a

denial of service.

Topics%20covered

Topics Covered

security advisory fetchmail DoS Ubuntu important network

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
  fetchmail                       6.4.39-1ubuntu0.1

Ubuntu 24.04 LTS
  fetchmail                       6.4.38-1ubuntu4.1

Ubuntu 22.04 LTS
  fetchmail                       6.4.27-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7838-1

CVE-2025-61962

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7838-1

Topics%20covered

Topics Covered

security advisory fetchmail DoS Ubuntu important network

Package Information

https://launchpad.net/ubuntu/+source/fetchmail/6.4.39-1ubuntu0.1
https://launchpad.net/ubuntu/+source/fetchmail/6.4.38-1ubuntu4.1
https://launchpad.net/ubuntu/+source/fetchmail/6.4.27-1ubuntu0.1

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