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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Published 2026-05-13 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.003 (18.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

my.f5.com/manage/s/article/K000161018 (vendor-advisory, Mitigation, patch, Vendor Advisory)

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.