Path Traversal in F5 Big-Iq
CVE-2026-20916
An authenticated iControl REST user with low privileges can create or modify arbitrary files through an undisclosed iControl REST endpoint on the BIG-IQ system. 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 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (27.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- F5 Big-Iq — versions 8.4.0
- F5 Big-Iq Centralized Management — versions 8.4.0
Weakness classification (CWE)
References
- my.f5.com/manage/s/article/K000158029 (vendor-advisory, Mitigation, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20916?
- CVE-2026-20916 is a high-severity vulnerability in F5 Big-Iq, classified under Path Traversal. CVSS score: 8.1/10. Published 2026-05-13.
- How severe is CVE-2026-20916?
- High severity. CVSS v3 base score is 8.1 out of 10.