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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.11.3-S1 – ≤ 9.16.50-S1, 9.18.11-S1 – ≤ 9.18.37-S1, 9.20.9-S1 – ≤ 9.20.10-S1 | 9.0.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.20.11-r0 | — |
| Alpine v3.23 | bind | 9.20.11-r0 | — |
| Alpine v3.22 | bind | 9.20.11-r0 | — |
Advisories 1
- WID-SEC-2025-1585 Internet Systems Consortium BIND: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 17, 2025
References
- CVE-2025-40776 vendor-advisory