CVE-2025-40775CWE-232

DNS message with invalid TSIG causes an assertion failure

High · published May 21, 2025

CVSS v3.1
7.5
EPSS
15%
Percentile
96.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.15225 · 96.5th percentile
Weakness
CWE-232 · Improper Handling of Undefined Values
Published
2025-05-21T12:35Z
EPSS history
Timeline
  • 21 MAY 12:35Z
    DNS message with invalid TSIG causes an assertion failure
    cvelistv5