{"id":"CVE-2021-33600","aliases":["EUVD-2021-20284","GHSA-453r-cx7v-94wr"],"status":"published","title":"Denial of Service Vulnerability in Web 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.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00607,"percentile":0.49385,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-617"],"published":"2021-09-28T09:06:55Z","modified":"2026-06-17T03:54:51Z","products":[{"vendor":"f-secure","product":"f-secure internet gatekeeper"},{"vendor":"f-secure","product":"internet_gatekeeper"}],"references":[{"url":"https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33600","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33600"},{"url":"https://github.com/advisories/GHSA-453r-cx7v-94wr"}],"sources":{"cve":[{"id":"CVE-2021-33600","title":"Denial of Service Vulnerability in Web 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.","status":"published","published":"2021-09-28T09:06:55Z","modified":"2024-08-03T23:50:43.178Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:10.204494Z"}],"euvd":[{"id":"EUVD-2021-20284","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.","status":"published","published":"2021-09-28T09:06:55Z","modified":"2024-08-03T23:50:43Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:24:33.866739Z"}],"ghsa":[{"id":"GHSA-453r-cx7v-94wr","title":"A denial-of-service (DoS) vulnerability was discovered in the web user interface of F-Secure...","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.","status":"published","published":"2022-05-24T19:16:01Z","modified":"2023-01-30T05:02:28Z","cwes":["CWE-617"],"updated_at":"2026-11-02T14:46:38.945282Z"}],"nvd":[{"id":"CVE-2021-33600","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.","status":"published","published":"2021-09-28T10:15:08.1Z","modified":"2026-06-17T03:54:51.387Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:06:58.933037Z"}]}}