CVE-2026-39458
BIG-IP DNS Cache vulnerability
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
When a BIG-IP DNS profile enabled with DNS cache is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
| CWE | CWE-824 |
| Vendor | f5 |
| Product | big-ip |
| Published | May 13, 2026 |
| Last Updated | May 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
F5 / BIG-IP
21.0.0 < 21.0.0.1 17.5.0 < 17.5.1.6 17.1.0 < 17.1.3.2 16.1.0 < *
Credits
F5