CVE-2025-40775
DNS message with invalid TSIG causes an assertion failure
HIGH 7.5
At a glance
- Source
- NVD
- EPSS
- EPSS 15.31 % · percentile 97 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- isc
- NVD status
- Deferred
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.
Weaknesses (CWE)
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | isc |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · security-officer@isc.org (Secondary) |
European references
- ENISA EUVD · EUVD-2025-16006
- GCVE · GCVE-0-2025-40775
CERT-FR advisories
- CERTFR-2025-AVI-0436 — Vulnérabilité dans ISC BIND · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| ISC · BIND 9 | affected 9.20.0 ≤ 9.20.8 ; affected 9.21.0 ≤ 9.21.7 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |