Bug ID 2338077: Upgrade Unbound DNS Resolver from version 1.23.1 to 1.25.1

Last Modified: Sep 02, 2026

Affected Product(s):
BIG-IP TMOS(all modules)

Fixed In:
21.1.0.2, 17.5.1.9, 17.1.3.5

Opened: Jun 15, 2026

Severity: 3-Major

Symptoms

The product includes Unbound version 1.23.1, which had robustness issues that were later fixed in subsequent Unbound releases

Impact

Robustness issues are addressed in Unbound 1.25.1

Conditions

This issue affects systems using the embedded Unbound DNS resolver version 1.23.1 or earlier

Workaround

None

Fix Information

Upgraded Unbound from version 1.23.1 to 1.25.1. This update remediates robustness issues

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips