{"id":"CVE-2020-27212","aliases":["EUVD-2020-19731","GHSA-whvf-9w6f-2rqw"],"status":"published","title":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash...","description":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.","severity":{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00342,"percentile":0.28127,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-74"],"published":"2021-05-21T11:48:27Z","modified":"2026-06-17T03:08:56Z","products":[{"vendor":"st","product":"stm32cubel4_firmware"}],"references":[{"url":"https://www.aisec.fraunhofer.de/en/FirmwareProtection.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://eprint.iacr.org/2021/640","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27212"},{"url":"https://github.com/advisories/GHSA-whvf-9w6f-2rqw"}],"sources":{"cve":[{"id":"CVE-2020-27212","description":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.","status":"published","published":"2021-05-21T11:48:27Z","modified":"2024-08-04T16:11:35.939Z","updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-19731","description":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.","status":"published","published":"2021-05-21T11:48:27Z","modified":"2024-08-04T16:11:35Z","updated_at":"2026-11-03T03:07:13.515696Z"}],"ghsa":[{"id":"GHSA-whvf-9w6f-2rqw","title":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash...","description":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.","status":"published","published":"2022-05-24T19:02:58Z","modified":"2023-01-29T05:06:18Z","cwes":["CWE-74"],"updated_at":"2026-11-02T14:45:59.496932Z"}],"nvd":[{"id":"CVE-2020-27212","description":"STMicroelectronics STM32L4 devices through 2020-10-19 have incorrect access control. The flash read-out protection (RDP) can be degraded from RDP level 2 (no access via debug interface) to level 1 (limited access via debug interface) by injecting a fault during the boot phase.","status":"published","published":"2021-05-21T12:15:07.73Z","modified":"2026-06-17T03:08:56.757Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.4,"vector":"AV:L/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-74"],"updated_at":"2026-11-02T14:06:39.25999Z"}]}}