BIND 9 fixes 1 vulnerability

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[TLP:CLEAR] BIND 9 fixes 1 vulnerability

BIND 9 fixes 1 vulnerability in versions 9.20.9 and 9.21.8 [1]. Debian stable releases [2], Ubuntu LTS releases [3] and Red Hat products [4] are not affected by this vulnerability. Gentoo has the vulnerable versions available only as testing [5].

BIND 9 - DoS (CVE-2025-40775)

CVSS 7.5 (High)

An unauthenticated remote attacker can cause a DoS by sending specially crafted DNS requests containing a TSIG section [6].

The vulnerability is present in product:

BIND; >=9.20, <9.20.9; >=9.21, <9.21.8;

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

More information:

CVE-2025-40775 at cve.org, NVD
CWE-232: Improper Handling of Undefined Values at cwe.mitre.org

The vulnerability was publicly disclosed 21. 5. 2025.

Links

By CESNET, z.s.p.o. Martin Krajči on 23. 5. 2025.

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[TLP:CLEAR] BIND 9 fixes 1 vulnerability

BIND 9 - DoS (CVE-2025-40775)

CVSS 7.5 (High)

Links