{"id":"CVE-2021-33910","title":"basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system c…","summary":"basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system c…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770","CWE-770"],"vendor":"systemd_project","product":"systemd","affected":["systemd < 246.15","systemd >= 247, < 247.8","systemd >= 248, < 248.5","systemd >= 249, < 249.1","fedora = 33","fedora = 34","debian_linux = 10.0","hci_management_node","solidfire"],"patched":["systemd 249.1"],"published":"2021-07-20","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:12.877","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-33910","references":[{"url":"http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/04/2","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/17/3","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2021/09/07/3","label":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b","label":"cve@mitre.org"},{"url":"https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202107-48","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20211104-0008/","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2021/dsa-4942","label":"cve@mitre.org"},{"url":"https://www.openwall.com/lists/oss-security/2021/07/20/2","label":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/04/2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2021/08/17/3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2021/09/07/3","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202107-48","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20211104-0008/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4942","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2021/07/20/2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-222547.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.08792,"epssPercentile":0.95081,"ingestedAt":"2026-10-14T12:29:10.822Z","slug":"CVE-2021-33910","body":"## Overview\n\nbasic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.\n\n## Affected\n\n- `systemd < 246.15`\n- `systemd >= 247, < 247.8`\n- `systemd >= 248, < 248.5`\n- `systemd >= 249, < 249.1`\n- `fedora = 33`\n- `fedora = 34`\n- `debian_linux = 10.0`\n- `hci_management_node`\n- `solidfire`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `systemd 249.1`","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":30.3,"likelihood":1.8,"exploitation":0,"ransomware":0},"changes":[]}