5.5

CVE-2021-3997: fedoraproject fedora Uncontrolled Recursion

CVSS: 5.5v3.1MediumModified
AliasesMGASA-2022-0016SUSE-SU-2022:0043-1SUSE-SU-2022:0539-1
Published 23-08-2022Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2021-3997 is a medium (CVSS 5.5) Uncontrolled Recursion vulnerability in fedoraproject fedora. EPSS estimates a 1.72% chance of exploitation in the next 30 days, higher than 77% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
1.72%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 23-08-2022
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

1.72%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

+0.16 pp

From 1.56% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.72%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (openwall.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Opensuse3 products
  • htmldoc&distro=openSUSE Leap 15.3< 1.9.12-bp153.2.6.1
  • systemd&distro=openSUSE Leap 15.3< 246.16-7.33.1 | < 246.16-150300.7.39.1
  • systemd&distro=openSUSE Tumbleweed< 249.7-3.1
Suse3 products
  • htmldoc&distro=SUSE Package Hub 15 SP3< 1.9.12-bp153.2.6.1
  • systemd&distro=SUSE Linux Enterprise Micro 5.1< 246.16-7.33.1 | < 246.16-150300.7.39.1
  • systemd&distro=SUSE Linux Enterprise Module for Basesystem 15 SP3< 246.16-7.33.1 | < 246.16-150300.7.39.1
Debian1 product
  • systemd< 250.2-1
Fedoraproject1 product
Mageia1 product
  • systemd< 246.16-2.mga8
Redhat1 product
Systemd_project1 product
Ubuntu1 product
  • systemdAll versions (No fix recorded) | < 245.4-4ubuntu3.15

8 vendors · 12 products

References

24 links
Show all 24 references