{"id":"CVE-2021-42059","title":"An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20","summary":"An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. A stack-based buffer overflow leads toarbitrary c…","severity":"medium","cvss":6.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"insyde","product":"insydeh2o","affected":["insydeh2o >= 5.0, < 5.08.41","insydeh2o >= 5.1, < 5.16.41","insydeh2o >= 5.2, < 5.26.41","insydeh2o >= 5.3, < 5.35.41","insydeh2o >= 5.4, < 5.42.20","simatic_field_pg_m5_firmware","simatic_field_pg_m6_firmware","simatic_ipc127e_firmware","simatic_ipc227g_firmware","simatic_ipc277g_firmware","simatic_ipc327g_firmware","simatic_ipc377g_firmware","simatic_ipc427e_firmware","simatic_ipc477e_firmware","simatic_ipc627e_firmware","simatic_ipc647e_firmware","simatic_ipc677e_firmware","simatic_ipc847e_firmware","simatic_itp1000_firmware"],"patched":["insydeh2o 5.42.20"],"published":"2022-02-03","updated":"2026-08-11","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-42059","references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20220216-0008/","label":"cve@mitre.org"},{"url":"https://www.insyde.com/security-pledge","label":"cve@mitre.org"},{"url":"https://www.insyde.com/security-pledge/SA-2022006","label":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220216-0008/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.insyde.com/security-pledge","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.insyde.com/security-pledge/SA-2022006","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/796611","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-306654.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.00346,"epssPercentile":0.25522,"ingestedAt":"2026-08-11T16:47:02.155Z","slug":"CVE-2021-42059","body":"## Overview\n\nAn issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. A stack-based buffer overflow leads toarbitrary code execution in UEFI DisplayTypeDxe DXE driver.\n\n## Affected\n\n- `insydeh2o >= 5.0, < 5.08.41`\n- `insydeh2o >= 5.1, < 5.16.41`\n- `insydeh2o >= 5.2, < 5.26.41`\n- `insydeh2o >= 5.3, < 5.35.41`\n- `insydeh2o >= 5.4, < 5.42.20`\n- `simatic_field_pg_m5_firmware`\n- `simatic_field_pg_m6_firmware`\n- `simatic_ipc127e_firmware`\n- `simatic_ipc227g_firmware`\n- `simatic_ipc277g_firmware`\n- `simatic_ipc327g_firmware`\n- `simatic_ipc377g_firmware`\n- `simatic_ipc427e_firmware`\n- `simatic_ipc477e_firmware`\n- `simatic_ipc627e_firmware`\n- `simatic_ipc647e_firmware`\n- `simatic_ipc677e_firmware`\n- `simatic_ipc847e_firmware`\n- `simatic_itp1000_firmware`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `insydeh2o 5.42.20`","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}