CVE-2023-40534
HIGHCVSS 7.5/10EPSS 0.54%
Last modified
CVE-2023-40534 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Access Policy Manager | 17.1.0 |
| F5 | Big-Ip Advanced Firewall Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Advanced Firewall Manager | 17.1.0 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Advanced Web Application Firewall | 17.1.0 |
| F5 | Big-Ip Analytics | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Analytics | 17.1.0 |
| F5 | Big-Ip Application Acceleration Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Application Acceleration Manager | 17.1.0 |
| F5 | Big-Ip Application Security Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Application Security Manager | 17.1.0 |
| F5 | Big-Ip Application Visibility And Reporting | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Application Visibility And Reporting | 17.1.0 |
| F5 | Big-Ip Carrier-Grade Nat | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Carrier-Grade Nat | 17.1.0 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Ddos Hybrid Defender | 17.1.0 |
| F5 | Big-Ip Domain Name System | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Domain Name System | 17.1.0 |
| F5 | Big-Ip Edge Gateway | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Edge Gateway | 17.1.0 |
| F5 | Big-Ip Fraud Protection Service | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Fraud Protection Service | 17.1.0 |
| F5 | Big-Ip Global Traffic Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Global Traffic Manager | 17.1.0 |
| F5 | Big-Ip Link Controller | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Link Controller | 17.1.0 |
| F5 | Big-Ip Local Traffic Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Local Traffic Manager | 17.1.0 |
| F5 | Big-Ip Next Service Proxy For Kubernetes | >= 1.6.0, <= 1.8.2 |
| F5 | Big-Ip Policy Enforcement Manager | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Policy Enforcement Manager | 17.1.0 |
| F5 | Big-Ip Ssl Orchestrator | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Ssl Orchestrator | 17.1.0 |
| F5 | Big-Ip Webaccelerator | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Webaccelerator | 17.1.0 |
| F5 | Big-Ip Websafe | >= 16.1.0, < 16.1.4.1 |
| F5 | Big-Ip Websafe | 17.1.0 |
References
- https://my.f5.com/manage/s/article/K000133467Vendor Advisory
- https://my.f5.com/manage/s/article/K000133467Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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 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.
How severe is CVE-2023-40534?
CVE-2023-40534 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.
How do I fix CVE-2023-40534?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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