CVE-2022-3821

Exp

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.

Published: 2022-11-08 Last update: 2025-05-02 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-3821 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.03%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2022-3821

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-3821

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.08% 0.03% -0.05%
2 2025-11-18 0.01% 0.08% +0.06%
3 2025-03-17 — 0.01% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-3821

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2022-3821

OS Trackers for CVE-2022-3821

vendor priority summary link
debian not yet assigned CVE-2022-3821 not yet assigned priority: Debian including 1 source packages (systemd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-3821
gentoo normal CVE-2022-3821: 1 GLSA(s) (202305-15), 4 atom(s) (sys-apps/systemd, sys-apps/systemd-tmpfiles, sys-apps/systemd-utils, sys-fs/udev); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-3821
redhat medium — https://access.redhat.com/security/cve/CVE-2022-3821
suse medium CVE-2022-3821 severity moderate: SUSE including 658 source package names (0.23.0.3.2.368:libsystemd0-246.16-150300.7.54.1, 0.23.0.3.2.368:libudev1-246.16-150300.7.54.1, …), 2085 product×package rows across 345 product lines (Container bci/bci-init, Container bci/dotnet-aspnet, … (345 product lines)): Fixed 1854, Known Not Affected 121, Known Affected 110. https://www.suse.com/security/cve/CVE-2022-3821/
ubuntu medium CVE-2022-3821 medium priority: Ubuntu including 1 source packages (systemd), 7 status rows across 7 suites (bionic, focal, jammy, kinetic, trusty, upstream, xenial): released 5, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2022-3821

Affected software / configurations for CVE-2022-3821

Vendor Product Version Raw CPE
systemd_project systemd <= 251 cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 9.0 cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

References for CVE-2022-3821

cvelogic Threat Intelligence