What is CVE-2026-5042?

CVE-2026-5042 is a high-severity vulnerability in Belkin F9k1122, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-29.

How severe is CVE-2026-5042?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Belkin F9k1122

CVE-2026-5042

A security flaw has been discovered in Belkin F9K1122 1.00.33. The affected element is the function formCrossBandSwitch of the file /goform/formCrossBandSwitch of the component Parameter Handler. The manipulation of the argument webpage re…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (28.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Belkin F9k1122 — versions 1.00.33

Weakness classification (CWE)

References

VDB-353965 | Belkin F9K1122 Parameter formCrossBandSwitch stack-based overflow (vdb-entry, technical-description)
VDB-353965 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #779123 | Belkin F9K1122 1.00.33 Stack-based Buffer Overflow (third-party-advisory)
github.com/Litengzheng/vul_db/blob/main/Belkin/vul_153/README.md (exploit)

Frequently asked questions

What is CVE-2026-5042?: CVE-2026-5042 is a high-severity vulnerability in Belkin F9k1122, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-03-29.
How severe is CVE-2026-5042?: High severity. CVSS v3 base score is 8.8 out of 10.