Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
CVE-2026-41218 Details
Description
When BIG-IP PEM iRules are configured on a virtual server (iRules using commands starting with CLASSIFICATION::, CLASSIFY::, PEM::, PSC::, and the urlcatquery command), 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 PEM when iRules are applied to a virtual server. This issue arises from certain iRule commands related to traffic classification and URL query manipulation. Under specific, undisclosed traffic conditions, this vulnerability can cause the Traffic Management Microkernel (TMM) to crash, disrupting service until the process is restarted.
Users can upgrade to BIG-IP versions 21.0.0.1, 17.5.1.4, or 17.1.3.1 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
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://my.f5.com/manage/s/article/K000160875 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [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
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 24, 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] |