The version of F5 Networks BIG-IP installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the K000162877 advisory.

    NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very     large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very     large RRsets with records that don't share a suffix above the root can cause Unbound to spend a     considerable time applying name compression to downstream replies. This can lead to degraded performance     and eventually denial of service in well orchestrated attacks. An adversary can exploit the vulnerability     by querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before     Unbound replies to the query it will try to apply name compression which was an unbounded operation that     could lock the CPU until the whole packet was complete. A compression limit was introduced in 1.21.1 for     this but it didn't account for the case where records would not share any suffix above the root. That     causes Unbound to go in a different code path because of the compression tree lookup failure and     eventually not increment the compression counter for those operations. Unbound 1.25.1 contains a patch     with a fix that increments the compression counter regardless of the compression tree lookup. This is a     complement fix to CVE-2024-8508.(CVE-2026-44390)

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000162877)

medium Nessus Plugin ID 334950

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Aug 31, 2026, 4:25 PM CVSS metrics ("Cvssv4 supplemental" set to "CVSS:4.0/U:Amber") Plugin Feed: 202608311625
Version 1.2 Aug 25, 2026, 3:54 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202608251554
Version 1.1 Aug 13, 2026, 12:31 AM New Plugin Feed: 202608130031