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7.5 High

CVE-2025-40775 When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it

Description

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it. If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure. This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.

Affected products and versions

Product Affected versions Fixed in
BIND 9 9.21 9.21.0 → 9.21.7 No fix stated
BIND 9 9.20 9.20.0 → 9.20.8 No fix stated

References

Timeline

  1. Published
  2. Last modified

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