---
id: CVE-2022-3821
title: >-
  An off-by-one Error issue was discovered in Systemd in format_timespan()
  function of time-util.c
summary: >-
  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 Se…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-193
vendor: systemd_project
product: systemd
affected:
  - systemd <= 251
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - fedora = 35
published: '2022-11-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:27.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-3821'
references:
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2139327'
    label: secalert@redhat.com
  - url: >-
      https://github.com/systemd/systemd/commit/9102c625a673a3246d7e73d8737f3494446bad4e
    label: secalert@redhat.com
  - url: 'https://github.com/systemd/systemd/issues/23928'
    label: secalert@redhat.com
  - url: 'https://github.com/systemd/systemd/pull/23933'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2023/06/msg00036.html'
    label: secalert@redhat.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RVBQC2VLSDVQAPJTEMTREXDL4HYLXG2P/
    label: secalert@redhat.com
  - url: 'https://security.gentoo.org/glsa/202305-15'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2139327'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/systemd/systemd/commit/9102c625a673a3246d7e73d8737f3494446bad4e
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/systemd/systemd/issues/23928'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/systemd/systemd/pull/23933'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/06/msg00036.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RVBQC2VLSDVQAPJTEMTREXDL4HYLXG2P/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202305-15'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.0042
epssPercentile: 0.34571
ingestedAt: '2026-10-14T15:36:13.926Z'
---

## Overview

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.

## Affected

- `systemd <= 251`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `fedora = 35`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.