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CVE-2025-40780 is a DNS cache poisoning vulnerability in BIND 9 affecting resolver and forwarder deployments. The flaw is caused by weakness in the pseudo-random number generator used by BIND, identified as xoshiro128**, to generate outbound DNS transaction IDs and UDP source ports. Because these values are core entropy sources used to validate replies to recursive queries, predictability in the PRNG can allow an off-path attacker to anticipate the parameters of outstanding DNS requests and forge matching responses that are accepted and cached. The issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.16.8-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1. Available reporting indicates the weakness also influences RRset shuffling behavior, further reflecting observable PRNG state. The vulnerability is associated with predictable values derived from observable state and enables practical remote cache poisoning against affected BIND resolvers under certain circumstances.
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A BIND DNS vulnerability where weak PRNG behavior can make DNS transaction parameters (source port and query ID) predictable, undermining DNS query randomness and enabling off-path attack scenarios in affected configurations.
A vulnerability listed as trending; no technical details provided in the content.
A BIND 9 DNS cache-poisoning vulnerability caused by weak PRNG behavior that can allow prediction of source ports and query IDs, enabling forged DNS responses to be accepted and cached.
A vulnerability in ISC BIND 9 affecting multiple versions, details unspecified in the content, but significant enough to warrant a security advisory and patch.
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Cross-references every affected SKU, including bundled OEM variants.
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