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CVE-2026-39458

BIG-IP DNS Cache vulnerability

HIGH
7.5
CVSS Score
Published: May 13, 2026 at 02:12 PM UTC
Updated: August 24, 2026 at 10:31 PM UTC
22 products affected across 1 vendorBig IP Access Policy ManagerBig IP Application Security ManagerBig IP Advanced Firewall Manager

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Access Policy Manager· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Advanced Firewall Manager· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Advanced Web Application Firewall· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Analytics· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Application Acceleration Manager· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Application Security Manager· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Application Visibility and Reporting· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Automation Toolchain· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
Big IP Carrier Grade Nat· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0
BIG-IP Container Ingress Services· F5
95%
16.1.0 ≤ v ≤ 16.1.617.1.0 ≤ v ≤ 17.1.317.5.0 ≤ v ≤ 17.5.121.0.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatchMitigation
Source: cverecord
https://my.f5.com/manage/s/article/K000160945

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHf5
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-824

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