{"id":"CVE-2021-45960","title":"In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).","summary":"In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-682","CWE-682"],"vendor":"libexpat_project","product":"libexpat","affected":["libexpat < 2.4.3","nessus < 8.15.3","nessus >= 10.0.0, < 10.1.1","debian_linux = 10.0","debian_linux = 11.0","sinema_remote_connect_server < 3.1","active_iq_unified_manager","hci_baseboard_management_controller = h610c","hci_baseboard_management_controller = h610s","hci_baseboard_management_controller = h615c","oncommand_workflow_automation","solidfire_&_hci_management_node"],"patched":["libexpat 2.4.3","nessus 10.1.1","sinema_remote_connect_server 3.1"],"published":"2022-01-01","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:17:10.723","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-45960","references":[{"url":"http://www.openwall.com/lists/oss-security/2022/01/17/3","label":"cve@mitre.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1217609","label":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"cve@mitre.org"},{"url":"https://github.com/libexpat/libexpat/issues/531","label":"cve@mitre.org"},{"url":"https://github.com/libexpat/libexpat/pull/534","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202209-24","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20220121-0004/","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2022/dsa-5073","label":"cve@mitre.org"},{"url":"https://www.tenable.com/security/tns-2022-05","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2022/01/17/3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1217609","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/libexpat/libexpat/issues/531","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/libexpat/libexpat/pull/534","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202209-24","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220121-0004/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2022/dsa-5073","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.tenable.com/security/tns-2022-05","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-484086.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","exploit-available"],"epss":0.04234,"epssPercentile":0.90811,"exploits":{"github":2,"githubRepos":["https://github.com/nanopathi/external_expat_AOSP10_r33_CVE-2021-45960","https://github.com/Trinadh465/external_lib_AOSP10_r33_CVE-2021-45960_CVE-2021-46143-"],"checkedAt":"2026-10-14T13:31:34.728Z"},"exploitAvailable":true,"ingestedAt":"2026-10-14T13:30:58.407Z","slug":"CVE-2021-45960","body":"## Overview\n\nIn Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).\n\n## Affected\n\n- `libexpat < 2.4.3`\n- `nessus < 8.15.3`\n- `nessus >= 10.0.0, < 10.1.1`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n- `sinema_remote_connect_server < 3.1`\n- `active_iq_unified_manager`\n- `hci_baseboard_management_controller = h610c`\n- `hci_baseboard_management_controller = h610s`\n- `hci_baseboard_management_controller = h615c`\n- `oncommand_workflow_automation`\n- `solidfire_&_hci_management_node`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libexpat 2.4.3`\n- `nessus 10.1.1`\n- `sinema_remote_connect_server 3.1`","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.8,"exploitation":12,"ransomware":0},"changes":[]}