Is CVE-2021-21671 in the CISA KEV catalog?

No. CVE-2021-21671 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21671?

CVE-2021-21671 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-21671?

CVE-2021-21671 has an EPSS score of 1.71% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21671?

Upgrade jenkins to 2.300 or later.

CVE & CISA-KEV Catalog

CVE-2021-21671

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.

How to fix

Remediation Available

jenkinsNVD

Affected:>= 2.266, < 2.300Fixed in:2.300CVE-2021-21671derived from NVD

Affected:>= 2.277.1, < 2.289.2Fixed in:2.289.2CVE-2021-21671derived from NVD

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 ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.71%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Vendor Advisory1

jenkins.io

Third-Party Advisory1

openwall.com

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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.