CVE-2025-40776
Birthday Attack against Resolvers supporting ECS
HIGH 8.6
At a glance
- Source
- NVD
- EPSS
- EPSS 0.23 % · percentile 13 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- isc
- NVD status
- Deferred
Description
A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.
Weaknesses (CWE)
- CWE-349 — Acceptance of Extraneous Untrusted Data With Trusted Data
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N | isc |
| CVSS 3.1 | HIGH 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N | NVD · security-officer@isc.org (Secondary) |
European references
- ENISA EUVD · EUVD-2025-21705
- GCVE · GCVE-0-2025-40776
CERT-FR advisories
- CERTFR-2025-AVI-0596 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| ISC · BIND 9 | affected 9.11.3-S1 ≤ 9.16.50-S1 ; affected 9.18.11-S1 ≤ 9.18.37-S1 ; affected 9.20.9-S1 ≤ 9.20.10-S1 ; unaffected 9.0.0 ≤ 9.20.10 |
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 |