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CVE-2025-8677

Resource exhaustion via malformed DNSKEY handling

High7.5EPSS 10.7%
Published
Updated
Reserved
Assigned by
isc

Description

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.

Scores

CVSS scores of CVE-2025-8677, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Deferred3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
10.7% · top 4.2% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • ISC · BIND 9

    • affected 9.18.0 – ≤ 9.18.39
    • affected 9.20.0 – ≤ 9.20.13
    • affected 9.21.0 – ≤ 9.21.12
    • affected 9.18.11-S1 – ≤ 9.18.39-S1
    • affected 9.20.9-S1 – ≤ 9.20.13-S1

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.41, 9.20.15, 9.21.14, 9.18.41-S1, or 9.20.15-S1.

Workaround: No workarounds known.

Exploitation: We are not aware of any active exploits.

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .