The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching     resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS     support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream     name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-     always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to     accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox     attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous     replies. (CVE-2025-5994)

Note that Nessus relies on the presence of the package as reported by the vendor.

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Linux Distros Unpatched Vulnerability : CVE-2025-5994

high Nessus Plugin ID 243988

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