Is CVE-2021-3997 in the CISA KEV catalog?

No. CVE-2021-3997 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3997?

CVE-2021-3997 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-3997?

CVE-2021-3997 has an EPSS score of 1.56% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3997?

Upgrade systemd on debian 11 to 247.3-7 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3997

MEDIUMEPSS 72th pctl

5.5

CVSS v3

NVD

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.

CWE-674

How to fix

Remediation Available

systemdDebian

Fixed in:247.3-7CVE-2021-3997

Fixed in:250.2-1CVE-2021-3997

systemdUbuntu

Fixed in:245.4-4ubuntu3.15USN-5226-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.56%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Patch2

Exploit1

openwall.com

Third-Party Advisory1

access.redhat.com

Other references1

security.gentoo.org

Related Vulnerabilities

Other CWE-674 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2024-25111	High	8.6	65%	-	Fix
CVE-2023-50269	High	8.6	58%	-	Fix
CVE-2021-42697	High	7.5	36%	-	Fix
CVE-2018-0739	Medium	6.5	19%	-	Fix
CVE-2007-1285	High	7.5	18%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.