{"id":"CVE-2021-27433","aliases":["EUVD-2021-14187","GHSA-5r3j-39g2-55xr"],"status":"published","title":"ARM mbed-ualloc memory library Integer Overflow or Wraparound","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","severity":{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01787,"percentile":0.78517,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190"],"published":"2022-05-03T20:26:51Z","modified":"2026-10-24T10:49:29Z","products":[{"vendor":"arm","product":"mbed-ualloc memory library"},{"vendor":"arm","product":"mbed_ualloc"}],"references":[{"url":"https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","US Government Resource","advisory"]},{"url":"https://github.com/ARMmbed/mbed-os/pull/14408","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27433"},{"url":"https://github.com/advisories/GHSA-5r3j-39g2-55xr"}],"sources":{"cve":[{"id":"CVE-2021-27433","title":"ARM mbed-ualloc memory library Integer Overflow or Wraparound","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T20:26:51Z","modified":"2025-04-16T16:24:24.018Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:33:04.679189Z"}],"euvd":[{"id":"EUVD-2021-14187","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T20:26:51Z","modified":"2025-04-16T16:24:24Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T20:52:24.329168Z"}],"ghsa":[{"id":"GHSA-5r3j-39g2-55xr","title":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function...","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-04T00:00:16Z","modified":"2023-02-01T05:01:28Z","cvss":[{"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"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:49:43.819101Z"}],"nvd":[{"id":"CVE-2021-27433","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T21:15:08.57Z","modified":"2026-06-17T03:44:51.197Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high","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-190"],"updated_at":"2026-11-02T14:07:06.029737Z"}],"osv":[{"id":"CVE-2021-27433","description":"ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.","status":"published","published":"2022-05-03T21:15:08.57Z","modified":"2026-10-24T10:49:29.60761543Z","cvss":[{"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"}],"updated_at":"2026-11-02T15:44:19.129331Z"}]}}