What is CVE-2026-42937?

CVE-2026-42937 is a medium-severity vulnerability in F5 Big-ip, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2026-05-13.

How severe is CVE-2026-42937?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in F5 Big-ip

CVE-2026-42937

Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) arp and ndp commands, and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view adjacent network information…

EPSS: 0.001 (16.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/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
F5 Big-iq — versions 8.4.0

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

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

Frequently asked questions

What is CVE-2026-42937?: CVE-2026-42937 is a medium-severity vulnerability in F5 Big-ip, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2026-05-13.
How severe is CVE-2026-42937?: Medium severity. CVSS v3 base score is 6.5 out of 10.