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 v3
7.5
EPSS
0.0008
EPSS Percentile
24.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-405
Status
published
Products (5)
ISC/BIND 9
9.18.0 - 9.18.39
ISC/BIND 9
9.18.11-S1 - 9.18.39-S1
ISC/BIND 9
9.20.0 - 9.20.13
ISC/BIND 9
9.20.9-S1 - 9.20.13-S1
ISC/BIND 9
9.21.0 - 9.21.12
Published
Oct 22, 2025
Tracked Since
Feb 18, 2026