CVE-2025-13878 ISC CVE debrief

Who should care

System administrators and security teams responsible for managing DNS infrastructure, particularly those using BIND 9, should be aware of this vulnerability. Given the HIGH severity and potential for service disruption, immediate attention is recommended. Additionally, organizations relying on BIND 9 for their DNS services should prioritize patching to prevent potential exploitation.

Technical summary

The vulnerability is caused by malformed BRID/HHIT records that can cause the `named` process in BIND 9 to terminate unexpectedly. This issue affects several versions of BIND 9, including 9.18.40 through 9.18.43, 9.20.13 through 9.20.17, 9.21.12 through 9.21.16, and their S1 counterparts. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7.5, indicating HIGH severity. The vulnerability is tracked under CVE-2025-13878.

Defensive priority

High priority should be given to patching affected BIND 9 installations to prevent service disruption. Administrators should review their current BIND 9 versions and update to patched versions (9.18.44, 9.20.18, 9.21.17, or later) as soon as possible.

Recommended defensive actions

• Review current BIND 9 versions and identify affected installations.
• Update affected BIND 9 installations to patched versions (9.18.44, 9.20.18, 9.21.17, or later).
• Verify that DNS services are functioning correctly after patching.
• Monitor DNS server logs for any unusual activity.
• Consider implementing additional monitoring and security measures for DNS infrastructure.

Evidence notes

The CVE-2025-13878 vulnerability is documented in the official CVE record and the National Vulnerability Database (NVD). The Internet Systems Consortium (ISC) provides patches for affected BIND 9 versions. Additional information and references can be found in the source item URL and other listed references.

Official resources