CVE-2025-40775

HIGH

BIND <9.20.8-9.21.7 - Info Disclosure

Title source: llm

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.

Exploits (1)

nomisec WORKING POC 5 stars
by AlexSvobo · poc
https://github.com/AlexSvobo/nhi-zero-trust-bypass

References (3)

Scores

CVSS v3 7.5
EPSS 0.0018
EPSS Percentile 39.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-232
Status published
Products (2)
ISC/BIND 9 9.20.0 - 9.20.8
ISC/BIND 9 9.21.0 - 9.21.7
Published May 21, 2025
Tracked Since Feb 18, 2026