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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.

PUBLISHED Reserved 2025-04-16 | Published 2025-05-21 | Updated 2025-05-23 | Assigner isc




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-232 Improper Handling of Undefined Values

Product status

Default status
unaffected

9.20.0 (custom)
affected

9.21.0 (custom)
affected

References

www.openwall.com/lists/oss-security/2025/05/21/1

security.netapp.com/advisory/ntap-20250523-0001/

kb.isc.org/docs/cve-2025-40775 (CVE-2025-40775) vendor-advisory

cve.org (CVE-2025-40775)

nvd.nist.gov (CVE-2025-40775)

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