What is CVE-2026-42780?

CVE-2026-42780 is a medium-severity vulnerability in F5 Big-ip, classified under Path Traversal. CVSS score: 4.9/10. Published 2026-05-13.

How severe is CVE-2026-42780?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Path Traversal in F5 Big-ip

CVE-2026-42780

A directory traversal vulnerability exists in BIG-IP SSL Orchestrator that allows an authenticated attacker with high privilege to overwrite, delete or corrupt arbitrary local files. Note: Software versions which have reached End of Techn…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.003 (55.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

Affected products

F5 Big-ip — versions 21.1.0, 21.0.0, 17.5.0
F5 Ssl Orchestrator — versions 14.0, 13.0, 12.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

f5sirt@f5.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-42780?: CVE-2026-42780 is a medium-severity vulnerability in F5 Big-ip, classified under Path Traversal. CVSS score: 4.9/10. Published 2026-05-13.
How severe is CVE-2026-42780?: Medium severity. CVSS v3 base score is 4.9 out of 10.