{"id":"CVE-2021-40833","aliases":["EUVD-2021-27990","GHSA-34hg-pm9j-p7gx"],"status":"published","title":"Denial-of-Service (DoS) Vulnerability","description":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00406,"percentile":0.35344,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-404"],"published":"2021-11-26T16:39:54Z","modified":"2026-06-17T04:07:30Z","products":[{"vendor":"f-secure","product":"atlant"},{"vendor":"f-secure","product":"elements_endpoint_protection"},{"vendor":"f-secure","product":"f-secure endpoint protection products on windows and mac. f-secure linux security (32-bit)  f-secure linux security 64 f-secure internet gatekeeper \u0026 f-secure atlant"},{"vendor":"f-secure","product":"internet_gatekeeper"},{"vendor":"f-secure","product":"linux_security"},{"vendor":"f-secure","product":"linux_security_64"}],"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-2021-40833","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40833"},{"url":"https://github.com/advisories/GHSA-34hg-pm9j-p7gx"}],"sources":{"cve":[{"id":"CVE-2021-40833","title":"Denial-of-Service (DoS) Vulnerability","description":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.","status":"published","published":"2021-11-26T16:39:54Z","modified":"2024-08-04T02:51:07.454Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27990","description":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.","status":"published","published":"2021-11-26T16:39:54Z","modified":"2024-08-04T02:51:07Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:24:19.692229Z"}],"ghsa":[{"id":"GHSA-34hg-pm9j-p7gx","title":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can...","description":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.","status":"published","published":"2022-05-24T19:21:19Z","modified":"2023-01-30T05:03:51Z","cwes":["CWE-404"],"updated_at":"2026-11-02T14:46:55.198962Z"}],"nvd":[{"id":"CVE-2021-40833","description":"A vulnerability affecting F-Secure antivirus engine was discovered whereby unpacking UPX file can lead to denial-of-service. The vulnerability can be exploited remotely by an attacker. A successful attack will result in denial-of-service of the antivirus engine.","status":"published","published":"2021-11-26T17:15:07.903Z","modified":"2026-06-17T04:07:30.343Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T14:07:01.428028Z"}]}}