{"id":"CVE-2023-4818","aliases":["EUVD-2023-54661","GHSA-hpqw-739g-5cvm"],"status":"published","title":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature...","description":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. \n\n\n\n\nThe attacker must have physical USB access to the device in order to exploit this vulnerability.","severity":{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00663,"percentile":0.52,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-74"],"published":"2024-01-15T13:28:53Z","modified":"2026-06-17T06:38:40Z","products":[{"vendor":"pax technology","product":"a920"},{"vendor":"paxtechnology","product":"paydroid"}],"references":[{"url":"https://ppn.paxengine.com/release/development","tags":["vendor-advisory","x_transferred","Permissions Required"]},{"url":"https://blog.stmcyber.com/pax-pos-cves-2023/","tags":["technical-description","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://cert.pl/en/posts/2024/01/CVE-2023-4818/","tags":["third-party-advisory","x_transferred","Third Party Advisory"]},{"url":"https://cert.pl/posts/2024/01/CVE-2023-4818/","tags":["third-party-advisory","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4818"},{"url":"https://blog.stmcyber.com/pax-pos-cves-2023"},{"url":"https://cert.pl/en/posts/2024/01/CVE-2023-4818"},{"url":"https://cert.pl/posts/2024/01/CVE-2023-4818"},{"url":"https://github.com/advisories/GHSA-hpqw-739g-5cvm"}],"sources":{"cve":[{"id":"CVE-2023-4818","description":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. \n\n\n\n\nThe attacker must have physical USB access to the device in order to exploit this vulnerability.","status":"published","published":"2024-01-15T13:28:53.084Z","modified":"2025-06-17T13:36:53.048Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-74"],"updated_at":"2026-11-02T14:35:30.474787Z"}],"euvd":[{"id":"EUVD-2023-54661","description":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. \n\n\n\n\nThe attacker must have physical USB access to the device in order to exploit this vulnerability.","status":"published","published":"2024-01-15T13:28:53Z","modified":"2025-06-17T13:36:53Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:32:22.732364Z"}],"ghsa":[{"id":"GHSA-hpqw-739g-5cvm","title":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature...","description":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. \n\n\n\n\nThe attacker must have physical USB access to the device in order to exploit this vulnerability.\n\n","status":"published","published":"2024-01-15T15:30:26Z","modified":"2024-10-10T18:32:15Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20","CWE-74"],"updated_at":"2026-11-02T14:58:28.497096Z"}],"nvd":[{"id":"CVE-2023-4818","description":"PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. \n\n\n\n\nThe attacker must have physical USB access to the device in order to exploit this vulnerability.","status":"published","published":"2024-01-15T14:15:25.18Z","modified":"2026-06-17T06:38:40.57Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-74"],"updated_at":"2026-11-02T14:09:01.900189Z"}]}}