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Date: Tue, 13 Feb 2024 14:39:32 +0100
From: Michał Kępień <>
Subject: ISC has disclosed six vulnerabilities in BIND 9 (CVE-2023-4408,
 CVE-2023-5517, CVE-2023-5679, CVE-2023-6516, CVE-2023-50387, CVE-2023-50868)

On 13 February 2024 we (Internet Systems Consortium) disclosed six vulnerabilities affecting our BIND 9 software:

- CVE-2023-4408:        Parsing large DNS messages may cause excessive CPU load
- CVE-2023-5517:        Querying RFC 1918 reverse zones may cause an assertion failure when "nxdomain-redirect" is enabled
- CVE-2023-5679:        Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution
- CVE-2023-6516:        Specific recursive query patterns may lead to an out-of-memory condition
- CVE-2023-50387:       KeyTrap - Extreme CPU consumption in DNSSEC validator
- CVE-2023-50868:       Preparing an NSEC3 closest encloser proof can exhaust CPU resources

New versions of BIND 9 are available from

Operators and package maintainers who prefer to apply patches selectively can find individual vulnerability-specific patches in the "patches" subdirectory of each published release directory:


With the public announcement of these vulnerabilities, the embargo period is ended and any updated software packages that have been prepared may be released.

Best regards,
Michał Kępień

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