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CVE-2021-33910

Published: Jul 20, 2021Updated: Jun 9, 2025 Sources: CVE List NVD BDU csafCWE-770
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
8.6%
Top 5.6%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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 Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-770

Affected Products

n/an/a
systemdsystemd project
On-prem
Operating Systems / linux-distro
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
hci management nodenetappHardware Firmware
systemd projectoss-projectOperating Systemsaka systemd
fedoraprojectoss-projectUSOperating Systemsaka fedora project
debianoss-projectGBOperating Systemsaka debian gnu/linux
netappcommercialUSHardware Firmware
and 13 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9
github.com
https://www.openwall.com/lists/oss-security/2021/07/20/2
openwall.com
https://security.gentoo.org/glsa/202107-48
security.gentoo.org
and 38 more references View all →

Timeline

Published
Jul 20, 2021
Last Updated
Jun 9, 2025

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