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Ubuntu 25.04: Bind Critical Denial of Service Crash USN-7641-1

ubuntu
Calendar Grey July 16, 2025
Dist Ubuntu Esm H88
Important patch released for Ubuntu Bind to address vulnerabilities caused by malformed network packets. Please update immediately!
Bind could be made to crash if it received specially crafted network traffic.

Summary

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

traffic.

Software Description:

- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled configurations where the

stale-answer-client-timeout option is set to 0. A remote attacker could

possibly use this issue to cause Bind to crash, resulting in a denial of

service.

Topics%20covered

Topics Covered

security advisory denial of service critical bind Ubuntu network traffic

Update Instructions

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

Ubuntu 25.04
  bind9                           1:9.20.4-3ubuntu1.2

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

References

https://ubuntu.com/security/notices/USN-7641-1

CVE-2025-40777

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7641-1

Topics%20covered

Topics Covered

security advisory denial of service critical bind Ubuntu network traffic

Package Information

https://launchpad.net/ubuntu/+source/bind9/1:9.20.4-3ubuntu1.2

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