How severe is CVE-2021-33601?

High severity. CVSS v3 base score is 7.6 out of 10.

Vulnerability in F-Secure Internet Gatekeeper

CVE-2021-33601

A vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. An authenticated user can modify settings through the web user interface in a way that could lead to an arbitrary code execution on the F-Secure Internet Gatekeeper server.

Published 2021-09-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (61.0th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

F-Secure Internet Gatekeeper — versions 5 Series All Version
F-Secure Internet Gatekeeper

References

www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame (Vendor Advisory)
www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-33601?: CVE-2021-33601 is a high-severity vulnerability in F-Secure Internet Gatekeeper. CVSS score: 7.6/10. Published 2021-09-28.
How severe is CVE-2021-33601?: High severity. CVSS v3 base score is 7.6 out of 10.