{"id":"CVE-2021-3434","aliases":["EUVD-2021-26760"],"status":"published","title":"L2CAP: Stack based buffer overflow in le_ecred_conn_req()","description":"Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions \u003e= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm","severity":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0021,"percentile":0.11215,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121","CWE-787"],"published":"2022-06-28T19:45:39Z","modified":"2026-06-17T04:05:05Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3434","title":"L2CAP: Stack based buffer overflow in le_ecred_conn_req()","description":"Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions \u003e= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm","status":"published","published":"2022-06-28T19:45:39.519Z","modified":"2024-09-17T00:36:23.34Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-26760","description":"Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions \u003e= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm","status":"published","published":"2022-06-28T19:45:39Z","modified":"2024-09-17T00:36:23Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T00:28:57.378482Z"}],"nvd":[{"id":"CVE-2021-3434","description":"Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions \u003e= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm","status":"published","published":"2022-06-28T20:15:08.24Z","modified":"2026-06-17T04:05:05.13Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-121","CWE-787"],"updated_at":"2026-11-02T14:07:06.501652Z"}]}}