CVE-2025-59781 HIGH

CVE-2025-59781: BIG-IP DNS cache vulnerability

Vendor F5
Product BIG-IP
Weakness CWE-459
Published October 15, 2025
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 15, 2025 CVE published
February 26, 2026 Record updated