Disclosure summary
Querying for records within a specially crafted zone containing certain malformed DNSKEY records can lead to CPU exhaustion. This issue affects BIND 9 versions 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Source-reported weakness categories
CWE-405
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-8677
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
Microsoft Security Updates (CVRF) · 2025-Oct
Open original source · Updated Nov 24, 2025
Resource exhaustion via malformed DNSKEY handling
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.5
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 bind 9.20.15-1 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 bind 9.16.50-2 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 bind 9.20.11-1 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 9.16.50-3 · product IDs 20589-17086
- Vendor guidance · product IDs 20589-17086
Original records & references
PUBLISHED 2025-10-22T12:15:46-04:00
MODIFIED 2026-10-08T07:10:00-04:00
INGESTED 2026-10-08T12:35:07-04:00