CVE-2026-41218
BIG-IP PEM iRules vulnerability
At a glance Severity HIGH 8.7 EPSS EPSS 0.26 % · percentile 18 (2026-10-27) State PUBLISHED Published 2026-05-13 Updated 2026-05-13 Assigner f5 NVD status Analyzed 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.
Scores Version Score Vector Scored by CVSS 3.1 HIGH 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H f5 CVSS 4.0 HIGH 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N f5 CVSS 4.0 HIGH 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X NVD · f5sirt@f5.com (Secondary) CVSS 3.1 HIGH 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD · f5sirt@f5.com (Secondary)
Weaknesses (CWE)
European references
CERT-FR advisories
Affected configurations (NVD CPE) cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_container_ingress_services:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_container_ingress_services:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1+44 more Affected products Product Versions F5 · BIG-IP unaffected 21.1.0 < * ; affected 21.0.0 < 21.0.0.1 ; affected 17.5.0 < 17.5.1.4 ; affected 17.1.0 < 17.1.3.1 ; affected 16.1.0 < *
References
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