{"id":"CVE-2021-3431","aliases":["EUVD-2021-26757"],"status":"published","title":"BT: Assertion failure on repeated LL_FEATURE_REQ","description":"Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions \u003e= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00916,"percentile":0.6043,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-617"],"published":"2022-06-28T19:45:23Z","modified":"2026-06-17T04:05:04Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3431","title":"BT: Assertion failure on repeated LL_FEATURE_REQ","description":"Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions \u003e= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9","status":"published","published":"2022-06-28T19:45:23.532Z","modified":"2024-09-16T22:52:14.507Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-26757","description":"Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions \u003e= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9","status":"published","published":"2022-06-28T19:45:23Z","modified":"2024-09-16T22:52:14Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:54:58.800859Z"}],"nvd":[{"id":"CVE-2021-3431","description":"Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions \u003e= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9","status":"published","published":"2022-06-28T20:15:08.083Z","modified":"2026-06-17T04:05:04.727Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:07:06.501652Z"}]}}