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CVE-2025-5994, known as the Rebirthday Attack, is a cache poisoning vulnerability affecting caching DNS resolvers that support EDNS Client Subnet (ECS). In Unbound, the issue is present when the software is compiled with ECS support and configured to send ECS information to upstream name servers. The vulnerability arises because resolvers supporting ECS must properly segregate outgoing queries based on differing ECS information. If replies lacking corresponding ECS context are accepted into cache, an attacker can exploit a birthday-paradox-style race to match DNS transaction IDs and cause non-ECS poisonous replies to be cached. In Unbound, this affects deployments using ECS-related options that forward client subnet data upstream.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.