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MEDIUM

CVE-2022-3821

CVSS v3

5.5

MEDIUM

EPSS Score

0.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • systemdAlmaLinux:9all versions · fixed in 250-12.el9_1.1and 9 other packages
  • systemdAlmaLinux:8all versions · fixed in 239-68.el8_7.1and 7 other packages

Vendor advisories

  • CVE-2022-3821 Red Hat Product Security358 products fixed · 11 known affected

    systemd: buffer overrun in format_timespan() function

    libgudev1 as a component of Red Hat Enterprise Linux 7 · libgudev1-devel as a component of Red Hat Enterprise Linux 7 · systemd as a component of Red Hat Enterprise Linux 7

  • RHSA-2024:1105 Red Hat Product Security77 products fixed

    Red Hat Security Advisory: systemd security update

  • ICSA-23-348-10 CISA5 known affected

    Siemens SIMATIC S7-1500

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)

  • SSA-398330 Siemens ProductCERT5 known affected

    SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

    SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.0 < V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.0 < V3.1.5

  • RHSA-2023:0336 Red Hat Product Security162 products fixed

    Red Hat Security Advisory: systemd security update

  • RHSA-2023:0100 Red Hat Product Security77 products fixed

    Red Hat Security Advisory: systemd security and bug fix update

Full record on NVD

Description

An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c. An attacker could supply specific values for time and accuracy that leads to buffer overrun in format_timespan(), leading to a Denial of Service.

Technical details

Published
2022-11-08

Frequently asked questions

What is CVE-2022-3821?

An off-by-one Error issue was discovered in Systemd in format_timespan() function of time-util.c. An attacker could supply specific values for time and accuracy that leads to buffer overrun in format_timespan(), leading to a Denial of Service.

Is CVE-2022-3821 actively exploited?

Active exploitation of CVE-2022-3821 has not been confirmed. Its EPSS score was 0.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-3821?

CVE-2022-3821 has a CVSS v3 base score of 5.5 (MEDIUM severity).

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