How severe is CVE-2021-21637?

CVE-2021-21637 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-21637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21637?

CVE-2021-21637 affects Jenkins Team Foundation Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21637?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21637 published?

CVE-2021-21637 was published on 2021-03-30 and last updated on 2026-06-17.

CVE-2021-21637

CVE-2021-21637 is a medium-severity vulnerability in Jenkins Team Foundation Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Jenkins Team Foundation Server
Published: 2021-03-30
Last modified: 2026-06-17

Description

A missing permission check in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.

Frequently asked questions

What is CVE-2021-21637?: A missing permission check in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.
How severe is CVE-2021-21637?: CVE-2021-21637 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-21637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21637?: CVE-2021-21637 affects Jenkins Team Foundation Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21637 published?: CVE-2021-21637 was published on 2021-03-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:team_foundation_server:*:*:*:*:*:jenkins:*:*

More vulnerabilities in Jenkins Team Foundation Server

CVE-2021-21638 — High (CVSS 8.8): A cross-site request forgery (CSRF) vulnerability in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows…
CVE-2021-21636 — Medium (CVSS 4.3): A missing permission check in Jenkins Team Foundation Server Plugin 5.157.1 and earlier allows attackers with…
CVE-2020-2249 — Low (CVSS 3.3): Jenkins Team Foundation Server Plugin 5.157.1 and earlier stores a webhook secret unencrypted in its global…

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