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    CVE-2021-33910

    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 crash.

    Published:Jul 20, 2021
    Last Modified:Jun 9, 2025
    EPS:Jul 20, 2021
    EPSS Score:0.0009
    CVSS Score:5.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Netapp
    Product
    Hci Management Node
    Vendor
    Netapp
    Product
    Solidfire
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhev Hypervisor
    Vendor
    Systemd Project
    Product
    Systemd

    Exploits

    http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlhttps://www.openwall.com/lists/oss-security/2021/07/20/2http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.htmlhttps://www.openwall.com/lists/oss-security/2021/07/20/2

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    References

    http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html
    http://www.openwall.com/lists/oss-security/2021/08/04/2
    http://www.openwall.com/lists/oss-security/2021/08/17/3
    http://www.openwall.com/lists/oss-security/2021/09/07/3
    https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
    https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b
    https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce
    https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538
    https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61
    https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b
    https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
    https://security.gentoo.org/glsa/202107-48
    https://security.netapp.com/advisory/ntap-20211104-0008/
    https://www.debian.org/security/2021/dsa-4942
    https://www.openwall.com/lists/oss-security/2021/07/20/2
    http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html
    http://www.openwall.com/lists/oss-security/2021/08/04/2
    http://www.openwall.com/lists/oss-security/2021/08/17/3
    http://www.openwall.com/lists/oss-security/2021/09/07/3
    https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
    https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b
    https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce
    https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538
    https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61
    https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b
    https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2LSDMHAKI4LGFOCSPXNVVSEWQFAVFWR7/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TMJVNYRY65B4QCJICBYOEIVZV3KUYI/
    https://security.gentoo.org/glsa/202107-48
    https://security.netapp.com/advisory/ntap-20211104-0008/
    https://www.debian.org/security/2021/dsa-4942
    https://www.openwall.com/lists/oss-security/2021/07/20/2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High