CVE-2026-42781
BIG-IP FastL4 virtual server vulnerability
HIGH 7.1
At a glance
- Source
- NVD
- EPSS
- EPSS 0.18 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- f5
- NVD status
- Analyzed
Description
When embedded Packet Velocity Acceleration (ePVA) acceleration is configured, undisclosed local ethernet traffic can cause an increase in ePVA and Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weaknesses (CWE)
- CWE-835 — Loop with Unreachable Exit Condition
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | f5 |
| CVSS 4.0 | HIGH 7.1 | CVSS:4.0/AV:A/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 7.1 | CVSS:4.0/AV:A/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 | MEDIUM 6.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · f5sirt@f5.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-30002
- GCVE · GCVE-0-2026-42781
CERT-FR advisories
- CERTFR-2026-AVI-0591 — Multiples vulnérabilités dans les produits F5 · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:f5:big-ip_access_policy_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_advanced_firewall_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_analytics:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_application_acceleration_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_application_security_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_automation_toolchain:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_carrier-grade_nat:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_container_ingress_services:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_domain_name_system:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_edge_gateway:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_fraud_protection_service:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_global_traffic_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_link_controller:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_local_traffic_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_policy_enforcement_manager:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_ssl_orchestrator:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_webaccelerator:21.0.0:*:*:*:*:*:*:*cpe:2.3:a:f5:big-ip_websafe:21.0.0:*:*:*:*:*:*:*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 ≤ 17.1.3- +23 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 ; unaffected 16.1.0 < * |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |