{"id":"CVE-2025-4134","aliases":["EUVD-2025-16299","GHSA-cj5g-8945-q3rg"],"status":"published","title":"Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00219,"percentile":0.12454,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-552"],"published":"2025-05-28T13:53:26Z","modified":"2026-06-17T09:32:34Z","products":[{"vendor":"avast","product":"avast business antivirus"}],"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-4134"},{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories"},{"url":"https://github.com/advisories/GHSA-cj5g-8945-q3rg"}],"sources":{"cve":[{"id":"CVE-2025-4134","title":"Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","status":"published","published":"2025-05-28T13:53:26.499Z","modified":"2025-05-28T14:06:40.254Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-552"],"updated_at":"2026-11-02T14:32:48.512547Z"}],"euvd":[{"id":"EUVD-2025-16299","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","status":"published","published":"2025-05-28T13:53:26Z","modified":"2025-05-28T14:06:40Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:32:37.456975Z"}],"ghsa":[{"id":"GHSA-cj5g-8945-q3rg","title":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux...","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","status":"published","published":"2025-05-28T15:34:34Z","modified":"2025-05-28T15:34:40Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-552"],"updated_at":"2026-11-02T15:02:27.916753Z"}],"nvd":[{"id":"CVE-2025-4134","description":"Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.","status":"published","published":"2025-05-28T14:15:34.26Z","modified":"2026-06-17T09:32:34.403Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-552"],"updated_at":"2026-11-02T14:11:10.143444Z"}]}}