Home/CVE/When a client-side HTTP/2 profile and the HTTP MRF Router option are enabled for a virtual server, and an iRule using th
CVE

CVE-2023-40534

When a client-side HTTP/2 profile and the HTTP MRF Router option are enabled for a virtual server, and an iRule using th

When a client-side HTTP/2 profile and the HTTP MRF Router option are enabled for a virtual server, and an iRule using the HTTP_REQUEST event or Local Traffic Policy are associated with the virtual server, undisclosed requests can cause TMM to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

HIGH · CVSS 7.5 EPSS 0.00571
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-401Missing Release of Memory after Effective Lifetime
▤

Affected Products & Versions

39
f5 big-ip access policy manager>= 16.1.0 and < 16.1.4.1
f5 big-ip access policy managerall versions
f5 big-ip advanced firewall manager>= 16.1.0 and < 16.1.4.1
f5 big-ip advanced firewall managerall versions
f5 big-ip advanced web application firewall>= 16.1.0 and < 16.1.4.1
f5 big-ip advanced web application firewallall versions
f5 big-ip analytics>= 16.1.0 and < 16.1.4.1
f5 big-ip analyticsall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · f5sirt@f5.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Oct 2023 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://my.f5.com/manage/s/article/K000133467Vendor Advisory
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