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CVE-2026-39458 Details
Description
When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), 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.
A denial-of-service vulnerability has been identified in F5 BIG-IP systems when a DNS profile with caching enabled is active on a virtual server. Undisclosed traffic can disrupt the Traffic Management Microkernel (TMM), causing it to terminate and disrupt service. This issue affects BIG-IP versions 21.0.0, 17.5.0 through 17.5.1, and 17.1.0 through 17.1.3, as well as BIG-IP Next for Kubernetes. BIG-IQ Centralized Management, F5 Distributed Cloud services, and NGINX One Console are not vulnerable.
Users can upgrade to BIG-IP versions 21.0.0.1, 17.5.1.6, or 17.1.3.2 to address this vulnerability. For more information about managing BIG-IP product hotfixes, refer to the F5 article K13123.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026Exploitation: NoneAutomatable: YesTechnical Impact: Partial
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://my.f5.com/manage/s/article/K000160945 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-824 | Access of Uninitialized Pointer | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| f5 big-ip access policy manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip advanced firewall manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip advanced web application firewall | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip analytics | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip application acceleration manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip application security manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip application visibility and reporting | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip automation toolchain | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip carrier-grade nat | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip container ingress services | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip ddos hybrid defender | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip domain name system | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip edge gateway | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip fraud protection service | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip global traffic manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip link controller | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip local traffic manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip policy enforcement manager | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip ssl orchestrator | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip webaccelerator | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
| f5 big-ip websafe | >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 21.0.0 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 24, 2026 | CVE Modified | [email protected] |
| Jun 29, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | New CVE Received | [email protected] |