{"id":"CVE-2021-3625","aliases":["EUVD-2021-26928"],"status":"published","title":"Buffer overflow in Zephyr USB DFU DNLOAD","description":"Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions \u003e= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363","severity":{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02312,"percentile":0.83534,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-122","CWE-787"],"published":"2021-10-05T20:50:20Z","modified":"2026-06-17T04:05:27Z","exploits":[{"source":"pocgithub","id":"szymonh/zephyr_cve-2021-3625","title":"szymonh/zephyr_cve-2021-3625","date":"2021-10-06","url":"https://github.com/szymonh/zephyr_cve-2021-3625"}],"products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3625","title":"Buffer overflow in Zephyr USB DFU DNLOAD","description":"Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions \u003e= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363","status":"published","published":"2021-10-05T20:50:20.352Z","modified":"2024-09-16T18:49:27.304Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26928","description":"Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions \u003e= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363","status":"published","published":"2021-10-05T20:50:20Z","modified":"2024-09-16T18:49:27Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:55:28.625786Z"}],"nvd":[{"id":"CVE-2021-3625","description":"Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions \u003e= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363","status":"published","published":"2021-10-05T21:15:09.463Z","modified":"2026-06-17T04:05:27.863Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T14:06:59.314106Z"}]}}