{"id":"CVE-2021-3321","aliases":["EUVD-2021-26652"],"status":"published","title":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal","description":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal. Zephyr versions \u003e= \u003e=2.4.0 contain Integer Overflow to Buffer Overflow (CWE-680). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00761,"percentile":0.55748,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-191","CWE-680"],"published":"2021-10-12T21:50:13Z","modified":"2026-06-17T04:04:56Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99","tags":["x_refsource_MISC","x_transferred","Exploit","Patch","Third Party Advisory"]}],"sources":{"cve":[{"id":"CVE-2021-3321","title":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal","description":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal. Zephyr versions \u003e= \u003e=2.4.0 contain Integer Overflow to Buffer Overflow (CWE-680). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99","status":"published","published":"2021-10-12T21:50:13.151Z","modified":"2024-09-16T22:51:00.317Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-680"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-26652","description":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal. Zephyr versions \u003e= \u003e=2.4.0 contain Integer Overflow to Buffer Overflow (CWE-680). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99","status":"published","published":"2021-10-12T21:50:13Z","modified":"2024-09-16T22:51:00Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-03T00:54:59.221564Z"}],"nvd":[{"id":"CVE-2021-3321","description":"Integer Underflow in Zephyr in IEEE 802154 Fragment Reassembly Header Removal. Zephyr versions \u003e= \u003e=2.4.0 contain Integer Overflow to Buffer Overflow (CWE-680). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w44j-66g7-xw99","status":"published","published":"2021-10-12T22:15:07.967Z","modified":"2026-06-17T04:04:56.27Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:A/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-680","CWE-191"],"updated_at":"2026-11-02T14:06:59.689345Z"}]}}