Is CVE-2018-6954 in the CISA KEV catalog?

No. CVE-2018-6954 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-6954?

CVE-2018-6954 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2018-6954?

CVE-2018-6954 has an EPSS score of 0.53% (41th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-6954?

Upgrade systemd on debian 11 to 238-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-6954

HIGH

7.8

CVSS v3

NVD

Description

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

CWE-59Link Following

How to fix

Remediation Available

systemdDebian

Fixed in:238-1CVE-2018-6954

systemdUbuntu

Fixed in:229-4ubuntu21.9USN-3816-2

Fixed in:229-4ubuntu21.8USN-3816-1

Fixed in:237-3ubuntu10.9USN-3816-2

Fixed in:237-3ubuntu10.6USN-3816-1

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.53%probability of exploitation in 30 days

41stpercentile

Moderate risk: more likely to be exploited than 41% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

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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 2025-06-09.