Is CVE-2023-3909 in the CISA KEV catalog?

No. CVE-2023-3909 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-3909?

CVE-2023-3909 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2023-3909?

CVE-2023-3909 has an EPSS score of 0.60% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-3909?

Upgrade gitlab on debian unstable to 16.4.4+ds2-2 or later.

CVE & CISA-KEV Catalog

CVE-2023-3909

MEDIUM

4.3

CVSS v3

NVD

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.3 before 16.3.6, all versions starting from 16.4 before 16.4.2, all versions starting from 16.5 before 16.5.1. A Regular Expression Denial of Service was possible by adding a large string in timeout input in gitlab-ci.yml file.

CWE-1333

How to fix

Remediation Available

gitlabDebian

Fixed in:16.4.4+ds2-2CVE-2023-3909

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.60%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-1333 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-3364	High	7.5	45%	-	Fix
CVE-2024-8124	High	7.5	40%	-	Fix
CVE-2024-25126	Medium	5.3	35%	-	Fix
CVE-2024-2651	Medium	6.5	33%	-	Fix
CVE-2021-32837	High	7.5	29%	-	Fix
CVE-2024-2829	High	7.5	26%	-	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 2025-05-05.