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.

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…

EPSS: 0.006 (69.0th percentile) — read the EPSS interpretation.

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.

Affected products

F5 Big-ip — versions 17.1.0, 16.1.0, 15.1.0
F5 Big-ip Next Spk — versions 1.6.0

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

my.f5.com/manage/s/article/K000133467 (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.