Vulnerability in Systemd Project
CVE-2021-3997
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.017 · change: +0.001
Affected products
- Systemd Project
- Fedoraproject Fedora — versions 34, 35
- Red Hat Enterprise Linux — versions 7.0, 8.0, 9.0
- Systemd — versions Fixed in v251-rc1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2022/01/10/2 (Exploit, Mailing List, Third Party Advisory)
- github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1 (Patch, Third Party Advisory)
- access.redhat.com/security/cve/CVE-2021-3997 (Third Party Advisory, Issue Tracking)
- security.gentoo.org/glsa/202305-15 (vendor-advisory)
Frequently asked questions
- What is CVE-2021-3997?
- CVE-2021-3997 is a medium-severity vulnerability in Systemd Project, classified under Uncontrolled Recursion. CVSS score: 5.5/10. Published 2022-08-23.
- How severe is CVE-2021-3997?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-3997 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.