CVE-2026-41218
BIG-IP PEM iRules vulnerability
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | f5 |
| Product | big-ip |
| Published | May 13, 2026 |
| Last Updated | May 13, 2026 |
Stay Ahead of the Next One
Get instant alerts for f5 big-ip
Be the first to know when new high vulnerabilities affecting f5 big-ip are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
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 < 17.5.1.4 17.1.0 < 17.1.3.1 16.1.0 < *
Credits
F5