{"id":"CVE-2021-33600","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-33600","generatedAt":"2026-10-28T06:49:22.953Z","title":"A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper.","description":"A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. The vulnerability occurs because of an attacker can trigger assertion via malformed HTTP packet to web interface. An unauthenticated attacker could exploit this vulnerability by sending a large username parameter. A successful exploitation could lead to a denial-of-service of the product.","published":"2021-09-28T10:15:08.000Z","lastModified":"2026-06-17T03:54:51.000Z","status":"Modified","sourceIdentifier":"cve-notifications-us@f-secure.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-617"],"affected":["f-secure/internet gatekeeper"],"epss":{"score":0.00607,"percentile":0.48827,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame","tags":["Vendor Advisory"],"source":"cve-notifications-us@f-secure.com"},{"url":"https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600","tags":["Vendor Advisory"],"source":"cve-notifications-us@f-secure.com"},{"url":"https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33600","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}