What is CVE-2026-42063?

CVE-2026-42063 is a medium-severity vulnerability in F5 Big-ip, classified under Files or Directories Accessible to External Parties. CVSS score: 4.9/10. Published 2026-05-13.

How severe is CVE-2026-42063?

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

Vulnerability in F5 Big-ip

CVE-2026-42063

A vulnerability exists in iControl SOAP where an authenticated attacker with the Resource Administrator or Administrator role can download sensitive files. Note: Software versions which have reached End of Technical Support (EoTS) are not…

EPSS: 0.001 (21.5th 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:H/I:N/A:N.

Affected products

F5 Big-ip — versions 21.1.0, 21.0.0, 17.5.0

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

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

Frequently asked questions

What is CVE-2026-42063?: CVE-2026-42063 is a medium-severity vulnerability in F5 Big-ip, classified under Files or Directories Accessible to External Parties. CVSS score: 4.9/10. Published 2026-05-13.
How severe is CVE-2026-42063?: Medium severity. CVSS v3 base score is 4.9 out of 10.