CVE-2026-41218
Analyzed
Analyzed - Analysis Complete
BaseFortify
Vulnerability report for CVE-2026-41218, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-05-13
Last updated on: 2026-06-24
Assigner: F5 Networks
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| f5 | big-ip_access_policy_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_advanced_firewall_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_advanced_web_application_firewall | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_analytics | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_application_acceleration_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_application_security_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_application_visibility_and_reporting | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_automation_toolchain | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_carrier-grade_nat | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_container_ingress_services | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_ddos_hybrid_defender | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_domain_name_system | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_edge_gateway | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_fraud_protection_service | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_link_controller | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_local_traffic_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_policy_enforcement_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_ssl_orchestrator | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_webaccelerator | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_websafe | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_global_traffic_manager | From 17.5.0 (inc) to 17.5.1 (inc) |
| f5 | big-ip_access_policy_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_advanced_firewall_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_advanced_web_application_firewall | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_analytics | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_application_acceleration_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_application_security_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_application_visibility_and_reporting | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_automation_toolchain | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_carrier-grade_nat | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_container_ingress_services | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_ddos_hybrid_defender | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_webaccelerator | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_websafe | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_ssl_orchestrator | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_policy_enforcement_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_local_traffic_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_link_controller | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_global_traffic_manager | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_fraud_protection_service | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_edge_gateway | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_domain_name_system | From 17.1.0 (inc) to 17.1.3 (inc) |
| f5 | big-ip_access_policy_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_advanced_firewall_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_advanced_web_application_firewall | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_analytics | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_application_acceleration_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_application_security_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_application_visibility_and_reporting | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_automation_toolchain | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_carrier-grade_nat | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_container_ingress_services | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_ddos_hybrid_defender | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_domain_name_system | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_edge_gateway | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_fraud_protection_service | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_global_traffic_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_link_controller | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_local_traffic_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_policy_enforcement_manager | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_ssl_orchestrator | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_webaccelerator | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_websafe | From 16.1.0 (inc) to 16.1.6 (inc) |
| f5 | big-ip_access_policy_manager | 21.0.0 |
| f5 | big-ip_advanced_firewall_manager | 21.0.0 |
| f5 | big-ip_advanced_web_application_firewall | 21.0.0 |
| f5 | big-ip_analytics | 21.0.0 |
| f5 | big-ip_application_acceleration_manager | 21.0.0 |
| f5 | big-ip_application_security_manager | 21.0.0 |
| f5 | big-ip_application_visibility_and_reporting | 21.0.0 |
| f5 | big-ip_automation_toolchain | 21.0.0 |
| f5 | big-ip_carrier-grade_nat | 21.0.0 |
| f5 | big-ip_container_ingress_services | 21.0.0 |
| f5 | big-ip_ddos_hybrid_defender | 21.0.0 |
| f5 | big-ip_domain_name_system | 21.0.0 |
| f5 | big-ip_edge_gateway | 21.0.0 |
| f5 | big-ip_fraud_protection_service | 21.0.0 |
| f5 | big-ip_global_traffic_manager | 21.0.0 |
| f5 | big-ip_link_controller | 21.0.0 |
| f5 | big-ip_local_traffic_manager | 21.0.0 |
| f5 | big-ip_policy_enforcement_manager | 21.0.0 |
| f5 | big-ip_ssl_orchestrator | 21.0.0 |
| f5 | big-ip_webaccelerator | 21.0.0 |
| f5 | big-ip_websafe | 21.0.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
