CVE-2026-41227

BIG-IP HTTP/2 Layer 7 Dos Protection 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

On an HTTP/2 virtual server with Layer 7 DoS Protection configured, undisclosed traffic can result in an increase in memory consumption causing the Traffic Management Microkernel (TMM) process 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)

CWE-770

European references

ENISA EUVD · EUVD-2026-29987
GCVE · GCVE-0-2026-41227

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_advanced_web_application_firewall:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1
cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:* ≥ 17.1.0 ≤ 17.1.3
cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:* ≥ 17.5.0 ≤ 17.5.1
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* ≥ 16.1.0 ≤ 16.1.6
cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* ≥ 16.1.0 ≤ 16.1.6
cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:* ≥ 16.1.0 ≤ 16.1.6

Affected products

Product	Versions
F5 · BIG-IP	unaffected 21.0.0 < * ; affected 17.5.0 < 17.5.1.4 ; affected 17.1.0 < 17.1.3.1 ; affected 16.1.0 < *

References

https://my.f5.com/manage/s/article/K000158979

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