VulnerabilityDeferred

CVE-2025-40775

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.

HIGH 7.5EPSS 15.2%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 15.22% probability · 97th percentile
CISA KEV: Not listed
Weakness: CWE-232
Source: security-officer@isc.org

References

https://kb.isc.org/docs/cve-2025-40775
http://www.openwall.com/lists/oss-security/2025/05/21/1
https://security.netapp.com/advisory/ntap-20250523-0001/

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.