CVE-2025-40775

DNS message with invalid TSIG causes an assertion failure

CVE-2025-40775 is fixed in 8 products on 1 platform, first by bind9 1:9.20.0-2ubuntu3.2, released May 21, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.1543

96th percentile

denial-of-service due to assertion failure caused by the processing of a NS message with an invalid

Where it's fixed

Product	Fixed in	Fix	Released
Linux
bind · sles 15.7	9.20.9-150700.3.3.1	SUSE-SU-2025:01787-1	May 30, 2025
bind9 · Debian 13.5 (trixie)	1:9.20.9-1	DEBIAN-CVE-2025-40775	May 21, 2025
bind9 · Debian 14	1:9.20.9-1	DEBIAN-CVE-2025-40775	May 21, 2025
bind9 · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9 · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9 1:9.20.4-3ubuntu1.1	May 21, 2025
bind9-dnsutils · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9-dnsutils 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9-dnsutils · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9-dnsutils 1:9.20.4-3ubuntu1.1	May 21, 2025
bind9-host · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9-host 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9-host · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9-host 1:9.20.4-3ubuntu1.1	May 21, 2025
bind9-libs · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9-libs 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9-libs · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9-libs 1:9.20.4-3ubuntu1.1	May 21, 2025
bind9-utils · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9-utils 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9-utils · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9-utils 1:9.20.4-3ubuntu1.1	May 21, 2025
bind9utils · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	bind9utils 1:9.20.0-2ubuntu3.2	May 21, 2025
bind9utils · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	bind9utils 1:9.20.4-3ubuntu1.1	May 21, 2025
dnsutils · Ubuntu 24.10 (oracular)	1:9.20.0-2ubuntu3.2	dnsutils 1:9.20.0-2ubuntu3.2	May 21, 2025
dnsutils · Ubuntu 25.04 (plucky)	1:9.20.4-3ubuntu1.1	dnsutils 1:9.20.4-3ubuntu1.1	May 21, 2025

Details

Published
May 21, 2025
Weakness
Improper Handling of Undefined Values
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40775

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