Vulnerability in F5 Big-Ip
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- F5 Big-Ip — versions 17.1.0, 16.1.0, 15.1.0
- F5 Big-Ip Access Policy Manager — versions 17.1.0
- F5 Big-Ip Advanced Firewall Manager — versions 17.1.0
- F5 Big-Ip Advanced Web Application Firewall — versions 17.1.0
- F5 Big-Ip Analytics — versions 17.1.0
- F5 Big-Ip Application Acceleration Manager — versions 17.1.0
- F5 Big-Ip Application Security Manager — versions 17.1.0
- F5 Big-Ip Application Visibility And Reporting — versions 17.1.0
- F5 Big-Ip Carrier-Grade Nat — versions 17.1.0
- F5 Big-Ip Ddos Hybrid Defender — versions 17.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- my.f5.com/manage/s/article/K000133467 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-40534?
- CVE-2023-40534 is a high-severity vulnerability in F5 Big-Ip, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2023-10-10.
- How severe is CVE-2023-40534?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-40534 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.