[USN-7641-1] Bind vulnerability

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Ubuntu Security Notice USN-7641-1
July 16, 2025

bind9 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04

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.

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

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