CVE-2025-40776 | THREATINT

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.

PUBLISHED Reserved 2025-04-16 | Published 2025-07-16 | Updated 2025-07-22 | Assigner isc

HIGH: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Problem types

CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data

Product status

Default status

unaffected

9.11.3-S1 (custom)

affected

9.18.11-S1 (custom)

affected

9.20.9-S1 (custom)

affected

9.0.0 (custom)

unaffected

Credits

ISC would like to thank Xiang Li from AOSP Lab of Nankai University for bringing this vulnerability to our attention.

References

kb.isc.org/docs/cve-2025-40776 (CVE-2025-40776) vendor-advisory

cve.org (CVE-2025-40776)

nvd.nist.gov (CVE-2025-40776)

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