CVE-2021-33910

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-33910
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-20 19:15:09 UTC
Updated2026-10-14 12:17:12 UTC
Descriptionbasic/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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770 | n/a | CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary4.9AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

AV:L/AC:L/Au:N/C:N/I:N/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Systemd Project Systemd All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
basic/unit-name: do not use strdupa() on a path · systemd/systemd-stable@4a1c5f3 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
oss-security - Re: Pop!_OS Membership to linux-distros list af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
[SECURITY] Fedora 33 Update: systemd-246.15-1.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com
CVE-2021-33910 Systemd Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
systemd: Multiple vulnerabilities (GLSA 202107-48) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
[SECURITY] Fedora 34 Update: systemd-248.5-1.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
basic/unit-name: do not use strdupa() on a path · systemd/systemd-stable@b006743 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
Merge pull request #20256 from keszybz/one-alloca-too-many · systemd/systemd@b34a4f0 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-222547.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
basic/unit-name: do not use strdupa() on a path by keszybz · Pull Request #20256 · systemd/systemd · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
basic/unit-name: do not use strdupa() on a path · systemd/systemd-stable@cfd14c6 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
oss-security - Re: Pop!_OS Membership to linux-distros list af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
basic/unit-name: do not use strdupa() on a path · systemd/systemd-stable@764b741 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
oss-security - CVE-2021-33910: Denial of service (stack exhaustion) in systemd (PID 1) af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Exploit, Mailing List, Third Party Advisory
Sequoia: A Deep Root In Linux's Filesystem Layer ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
Debian -- Security Information -- DSA-4942-1 systemd af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
oss-security - Re: Pop!_OS Membership to linux-distros list af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
FEDORA:FEDORA-2021-166e461c8d MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: systemd-248.5-1.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
Releases · systemd/systemd · GitHub MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159309 Oracle Enterprise Linux Security Update for systemd (ELSA-2021-2717)
  • 178709 Debian Security Update for systemd (DSA 4942-1)
  • 178711 Debian Security Update for systemd (DLA 2715-1)
  • 179870 Debian Security Update for systemd (CVE-2021-33910)
  • 198434 Ubuntu Security Notification for systemd vulnerabilities (USN-5013-1)
  • 239496 Red Hat Update for systemd (RHSA-2021:2724)
  • 239499 Red Hat Update for systemd (RHSA-2021:2721)
  • 239503 Red Hat Update for systemd (RHSA-2021:2717)
  • 239520 Red Hat Update for OpenShift Container Platform 4.7.21 (RHSA-2021:2763)
  • 281733 Fedora Security Update for systemd (FEDORA-2021-2a6ba64260)
  • 281739 Fedora Security Update for systemd (FEDORA-2021-166e461c8d)
  • 375711 Linux systemd Denial of Service Vulnerability
  • 590976 Siemens SCALANCE LPE9403 Third-Party Multiple Vulnerabilities (ICSA-22-167-09) (SSA-222547)
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 6140178 AWS Bottlerocket Security Update for systemd (GHSA-x6h2-jvgx-gwph)
  • 670729 EulerOS Security Update for systemd (EulerOS-SA-2021-2487)
  • 670821 EulerOS Security Update for systemd (EulerOS-SA-2021-2700)
  • 670837 EulerOS Security Update for systemd (EulerOS-SA-2021-2725)
  • 710021 Gentoo Linux systemd Multiple vulnerabilities (GLSA 202107-48)
  • 750843 SUSE Enterprise Linux Security Update for systemd (SUSE-SU-2021:2405-1)
  • 750845 OpenSUSE Security Update for the systemd (openSUSE-SU-2021:2404-1)
  • 750846 OpenSUSE Security Update for the systemd (openSUSE-SU-2021:2410-1)
  • 750865 SUSE Enterprise Linux Security Update for systemd (SUSE-SU-2021:2423-1)
  • 750892 OpenSUSE Security Update for systemd (openSUSE-SU-2021:1082-1)
  • 751002 OpenSUSE Security Update for systemd (openSUSE-SU-2021:2809-1)
  • 751220 OpenSUSE Security Update for systemd (openSUSE-SU-2021:3348-1)
  • 751244 OpenSUSE Security Update for systemd (openSUSE-SU-2021:1370-1)
  • 751324 SUSE Enterprise Linux Security Update for systemd (SUSE-SU-2021:3611-1)
  • 900239 CBL-Mariner Linux Security Update for systemd 239
  • 903616 Common Base Linux Mariner (CBL-Mariner) Security Update for systemd (4642)
  • 940289 AlmaLinux Security Update for systemd (ALSA-2021:2717)
  • 960011 Rocky Linux Security Update for systemd (RLSA-2021:2717)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report