Is CVE-2021-4178 in the CISA KEV catalog?

No. CVE-2021-4178 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4178?

CVE-2021-4178 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2021-4178?

CVE-2021-4178 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4178?

Upgrade jenkins on rhel 8 to 0:2.387.3.1684911776-3.el8 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4178

MEDIUM

6.7

CVSS v3

NVD

Description

A arbitrary code execution flaw was found in the Fabric 8 Kubernetes client affecting versions 5.0.0-beta-1 and above. Due to an improperly configured YAML parsing, this will allow a local and privileged attacker to supply malicious YAML.

CWE-502Deserialization of Untrusted Data

How to fix

Remediation Available

jenkinsRed Hat / RHEL

Fixed in:0:2.387.3.1684911776-3.el8RHSA-2023:3299

jenkinsRocky

Fixed in:0:2.387.3.1684911776-3.el8RHSA-2023:3299

jenkins-2-pluginsRocky

Fixed in:0:4.13.1684911916-1.el8RHSA-2023:3299

jenkins-2-pluginsRed Hat / RHEL

Fixed in:0:4.13.1684911916-1.el8RHSA-2023:3299

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory2

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-47986	Critical	9.8	100%	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 2024-11-21.