High severity · published Oct 22, 2025
CVE-2025-8677
Resource exhaustion via malformed DNSKEY handling
7.5
CVSS
10.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)10.7% · higher than 96% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
B9
BIND 9 · ISC
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; 9.20.9-S1 through 9.20.13-S1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-8677
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-8677
kb.isc.org
https://kb.isc.org/docs/cve-2025-8677
www.openwall.com
http://www.openwall.com/lists/oss-security/2025/10/22/1
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