---
id: CVE-2025-8677
title: >-
  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.…
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.…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-405
published: '2025-10-22'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-8677'
references:
  - url: 'https://kb.isc.org/docs/cve-2025-8677'
    label: security-officer@isc.org
  - url: 'http://www.openwall.com/lists/oss-security/2025/10/22/1'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.10737
epssPercentile: 0.95723
ingestedAt: '2026-10-08T11:31:27.548Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.