What is CVE-2026-42408?

CVE-2026-42408 is a medium-severity vulnerability in F5 Big-ip, classified under Cleartext Storage of Sensitive Information. CVSS score: 4.4/10. Published 2026-05-13.

How severe is CVE-2026-42408?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in F5 Big-ip

CVE-2026-42408

When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information. Note: Software versions which have reached End of…

EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

Affected products

F5 Big-ip — versions 21.0.0, 17.5.0, 17.1.0

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

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

Frequently asked questions

What is CVE-2026-42408?: CVE-2026-42408 is a medium-severity vulnerability in F5 Big-ip, classified under Cleartext Storage of Sensitive Information. CVSS score: 4.4/10. Published 2026-05-13.
How severe is CVE-2026-42408?: Medium severity. CVSS v3 base score is 4.4 out of 10.