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The VUXML data was last processed by FreshPorts on 2025-09-28 16:19:23 UTC

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VuXML IDDescription
e27ee4fc-cdc9-45a1-8242-09898cdbdc91unbound -- Cache poisoning via the ECS-enabled Rebirthday Attack

sep@nlnetlabs.nl reports:

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.


Discovery 2025-07-16
Entry 2025-07-18
unbound
> 1.6.1 lt 1.23.0

CVE-2025-5994
https://nvd.nist.gov/vuln/detail/CVE-2025-5994