What is CVE-2026-42781?

CVE-2026-42781 is a medium-severity vulnerability in F5 Big-ip, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-05-13.

How severe is CVE-2026-42781?

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

Vulnerability in F5 Big-ip

CVE-2026-42781

When embedded Packet Velocity Acceleration (ePVA) acceleration is configured, undisclosed local ethernet traffic can cause an increase in ePVA and Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which ha…

EPSS: 0.000 (9.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

F5 Big-ip — versions 21.1.0, 21.0.0, 17.5.0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

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

Frequently asked questions

What is CVE-2026-42781?: CVE-2026-42781 is a medium-severity vulnerability in F5 Big-ip, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 6.5/10. Published 2026-05-13.
How severe is CVE-2026-42781?: Medium severity. CVSS v3 base score is 6.5 out of 10.