The version of unbound installed on the remote host is prior to 1.17.0-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2UNBOUND-1.17-2025-007 advisory.

    NLnet Labs Unbound up to and including version 1.24.0 is vulnerable to possible domain hijack attacks.
    Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick     resolvers to update their delegation information for the zone. Usually these RRSets are used to update the     resolver's knowledge of the zone's name servers. A malicious actor can exploit the possible poisonous     effect by injecting NS RRSets (and possibly their respective address records) in a reply. This could be     done for example by trying to spoof a packet or fragmentation attacks. Unbound would then proceed to     update the NS RRSet data it already has since the new data has enough trust for it, i.e., in-zone data for     the delegation point. Unbound 1.24.1 includes a fix that scrubs unsolicited NS RRSets (and their     respective address records) from replies mitigating the possible poison effect. (CVE-2025-11411)

Tenable has extracted the preceding description block directly from the tested product 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

Analytics

Amazon Linux 2 : unbound, --advisory ALAS2UNBOUND-1.17-2025-007 (ALASUNBOUND-1.17-2025-007)

high Nessus Plugin ID 277760

Version 1.2

Version 1.1

Version 1.2 Feb 26, 2026, 8:51 AM CVSS metrics ("Cvssv4 threat score" set to 5.7) CVSS metrics ("Cvssv4 threat vector" set to "CVSS:4.0/E:P") Plugin Feed: 202602260851
Version 1.1 Dec 9, 2025, 2:31 AM New Plugin Feed: 202512090231