CVE-2021-21615

Q: How do I fix CVE-2021-21615?

Upgrade jenkins to 2.263.3 or later.

Q: Is CVE-2021-21615 being actively exploited?

Not that we know of. CVE-2021-21615 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.90% is the estimated probability that it will be exploited in the next 30 days. That is higher than 56% of all scored CVEs.

Q: How severe is CVE-2021-21615?

CVE-2021-21615 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-21615 affect?

Published advisories record a fix for jenkins (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.3

CVSS v3

NVD

Description

Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

CWE-367TOCTOU Race Condition

How to fix

Remediation Available

jenkinsNVD

Affected:< 2.263.3Fixed in:2.263.3CVE-2021-21615derived from NVD

Affected:< 2.276Fixed in:2.276CVE-2021-21615derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.90%probability of exploitation in 30 days

56thpercentile

Moderate risk: more likely to be exploited than 56% of all known CVEs.

References

Vendor Advisory1

jenkins.io

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-367 (TOCTOU Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-36980	High	8.1	83%	-	Fix
CVE-2024-30088	High	7.0	68%	KEV + Ransom	Fix
CVE-2004-0594	Medium	5.1	55%	-	Fix
CVE-2024-50379	Critical	9.8	44%	-	Fix
CVE-2023-38146	High	8.8	39%	-	Fix
CVE-2024-0132	Critical	9.0	38%	-	Fix

Common questions

How do I fix CVE-2021-21615?

Upgrade jenkins to 2.263.3 or later.

Is CVE-2021-21615 being actively exploited?

Not that we know of. CVE-2021-21615 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.90% is the estimated probability that it will be exploited in the next 30 days. That is higher than 56% of all scored CVEs.

How severe is CVE-2021-21615?

CVE-2021-21615 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-21615 affect?

Published advisories record a fix for jenkins (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-21615

Markdown

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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.