What is CVE-2025-55036?

CVE-2025-55036 is a high-severity vulnerability in F5 Big-Ip, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2025-10-15.

How severe is CVE-2025-55036?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in F5 Big-Ip

CVE-2025-55036

When BIG-IP SSL Orchestrator explicit forward proxy is configured on a virtual server and the proxy connect feature is enabled, undisclosed traffic may cause memory corruption. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (24.9th 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 17.5.0, 17.1.0, 16.1.0
F5 Big-ip_ssl_orchestrator

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

f5sirt@f5.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-55036?: CVE-2025-55036 is a high-severity vulnerability in F5 Big-Ip, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2025-10-15.
How severe is CVE-2025-55036?: High severity. CVSS v3 base score is 7.5 out of 10.