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 Technical Support (EoTS) are not evaluated.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.012 (67.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.012 · change: +0.003
Affected products
- F5 Big-Ip — versions 21.1.0, 21.0.0, 17.5.0
- F5 Big-Ip SSL Orchestrator — versions 21.0.0
- F5 SSL Orchestrator — versions 14.0, 13.0, 12.0
Weakness classification (CWE)
References
- my.f5.com/manage/s/article/K000149743 (vendor-advisory, Mitigation, patch, Vendor Advisory)
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.