CVE-2021-33910

MEDIUM
Published Jul 20, 20214y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 20, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-770

Affected Products 9

VendorProductVersionRange
systemd_projectsystemd* <246.15
systemd_projectsystemd*≥247  –  <247.8
systemd_projectsystemd*≥248  –  <248.5
systemd_projectsystemd*≥249  –  <249.1
fedoraprojectfedora33any
fedoraprojectfedora34any
debiandebian_linux10.0any
netapphci_management_node*any
netappsolidfire*any

References 17

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

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2021/08/04/2
    Mailing ListPatchThird Party Advisory
  • openwall.com http://www.openwall.com/lists/oss-security/2021/08/17/3
    Mailing ListPatchThird Party Advisory
  • openwall.com http://www.openwall.com/lists/oss-security/2021/09/07/3
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/systemd/systemd-stable/commit/4a1c5f34bd3e1daed4490e9d97918e504d19733b
    PatchThird Party Advisory
  • github.com https://github.com/systemd/systemd-stable/commit/764b74113e36ac5219a4b82a05f311b5a92136ce
    PatchThird Party Advisory
  • github.com https://github.com/systemd/systemd-stable/commit/b00674347337b7531c92fdb65590ab253bb57538
    PatchThird Party Advisory
  • github.com https://github.com/systemd/systemd-stable/commit/cfd14c65374027b34dbbc4f0551456c5dc2d1f61
    PatchThird Party Advisory
  • github.com https://github.com/systemd/systemd/commit/b34a4f0e6729de292cb3b0c03c1d48f246ad896b
    PatchThird Party Advisory
  • github.com https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9
    PatchThird Party Advisory