Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-41218

Severity CVSS v4.0:
HIGH
Type:
CWE-416 Use After Free
Publication date:
13/05/2026
Last modified:
24/06/2026

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.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 8.70 HIGH
Vector: 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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
8.70
Severity 4.0
HIGH
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)
cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:* 17.5.0 (including) 17.5.1 (including)
cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:* 17.1.0 (including) 17.1.3 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools