The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.5 / 17.5.1.9 / 21.1.0.2. It is, therefore, affected by multiple vulnerabilities as referenced in the K000162456 advisory.

    CVE-2026-41292NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of     service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with     too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data     structures for the options. Coordinated attacks can result in degradation and/or denial of service.
    Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options     (100).CVE-2026-42944NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that     results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in     the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be     enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the     vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query.
    A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to     overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound     controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the     EDNS options and a fix to prevent truncation of the EDNS field size calculation.

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

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

Detections

Analytics

F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000162456)

high Nessus Plugin ID 330218

Version 1.3

Version 1.2

Version 1.1

Version 1.3 Sep 12, 2026, 3:33 AM CVSS metrics ("Cvssv4 supplemental" set to none) Detection (updated detection logic) Plugin metadata Plugin Feed: 202609120333
Version 1.2 Aug 4, 2026, 11:08 AM CVSS metrics ("Cvssv4 supplemental" set to "CVSS:4.0/U:Amber") Plugin Feed: 202608041108
Version 1.1 Jul 28, 2026, 1:30 PM New Plugin Feed: 202607281330