5.5

CVE-2021-33910: debian debian_linux

Modified
AliasesSUSE-SU-2021:2404-1SUSE-SU-2021:2405-1SUSE-SU-2021:2410-1
Published 20-07-2021Last modified 14-10-2026

Vulnerability summary

CVE-2021-33910 is a medium (CVSS 5.5) vulnerability in debian debian_linux. EPSS estimates a 8.79% chance of exploitation in the next 30 days, higher than 95.1% of scored vulnerabilities. 2 public exploits are recorded.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
8.79%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits2reference

Advisory lineage

Upstream 0 · Downstream 7 · Related 6
MGASA-2021-0365OPENSUSE-SU-2021:2809-1OPENSUSE-SU-2024:11420-1RHSA-2021:2736SUSE-SU-2021:2809-1USN-5013-1

Timeline

  1. 20-07-2021
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 6 sources · 2 versions

EPSS trend

Probability

8.79%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

No change 0.00 pp

From 8.79% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (openwall.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat16 products
  • systemd< 0:239-45.el8_4.2 | < 0:239-31.el8_2.4 | < 0:239-18.el8_1.8
  • systemd-container< 0:239-45.el8_4.2 | < 0:239-31.el8_2.4 | < 0:239-18.el8_1.8
  • systemd-container-debuginfo< 0:239-45.el8_4.2 | < 0:239-31.el8_2.4 | < 0:239-18.el8_1.8
  • systemd-debuginfo< 0:239-45.el8_4.2 | < 0:239-31.el8_2.4 | < 0:239-18.el8_1.8
  • systemd-debugsource< 0:239-45.el8_4.2 | < 0:239-31.el8_2.4 | < 0:239-18.el8_1.8
Suse16 products
  • systemd&distro=HPE Helion OpenStack 8< 228-150.98.1
  • systemd&distro=SUSE Linux Enterprise Module for Basesystem 15 SP2< 234-24.90.1 | < 234-24.93.1
  • systemd&distro=SUSE Linux Enterprise Module for Basesystem 15 SP3< 246.13-7.8.1
  • systemd&distro=SUSE Linux Enterprise Server 12 SP2-BCL< 228-150.98.1
  • systemd&distro=SUSE Linux Enterprise Server 12 SP3-BCL< 228-150.98.1
Chainguard5 products
  • py3-systemdAll versions (No fix recorded)
  • py3.10-systemdAll versions (No fix recorded)
  • py3.11-systemdAll versions (No fix recorded)
  • py3.12-systemdAll versions (No fix recorded)
  • py3.13-systemdAll versions (No fix recorded)
Opensuse3 products
  • systemd-mini&distro=openSUSE Leap 15.2< 234-lp152.31.31.1 | < 234-lp152.31.34.1
  • systemd&distro=openSUSE Leap 15.2< 234-lp152.31.31.1 | < 234-lp152.31.34.1
  • systemd&distro=openSUSE Leap 15.3< 234-24.90.1 | < 246.13-7.8.1 | < 234-24.93.1
Debian2 products
  • systemd< 241-7~deb10u8 | < 232-25+deb9u13 | < 247.3-6
  • debian_linuxEOL10.0
Netapp2 products
Fedoraproject1 product
Systemd_project1 product
  • systemd< 246.15 | ≥ 247, < 247.8 | ≥ 248, < 248.5 | ≥ 249, < 249.1
Ubuntu1 product
  • systemd< 229-4ubuntu21.31+esm1 | < 237-3ubuntu10.49 | < 245.4-4ubuntu3.10

9 vendors · 47 products

References

65 links
Show all 65 references