CVE-2025-59781

BIG-IP DNS cache vulnerability

State: Published
Severity: 8.7 High
Published: Oct 15, 2025
Updated: Feb 26, 2026
Reserved: Oct 3, 2025

Description

When DNS cache is configured on a BIG-IP or BIG-IP Next CNF virtual server, undisclosed DNS queries can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L	f5
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	f5

Weaknesses

CWE-459 Incomplete Cleanup

Affected Products

Product	Versions
BIG-IPF5	17.5.0 and laterNot affected 17.1.0 to before 17.1.2.2Affected 16.1.0 to before 16.1.6Affected 15.1.0 to before 15.1.10.8Affected
BIG-IP Next CNFF5	2.0.0 and laterNot affected 1.1.0 and laterAffectedfrom 1.4.0-EHF-3Not affected

References

https://my.f5.com/manage/s/article/K000150637vendor-advisory

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