How severe is CVE-2021-37540?

CVE-2021-37540 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-37540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37540?

CVE-2021-37540 affects Jetbrains Hub. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-37540?

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

When was CVE-2021-37540 published?

CVE-2021-37540 was published on 2021-08-06 and last updated on 2026-06-17.

CVE-2021-37540

CVE-2021-37540 is a medium-severity vulnerability in Jetbrains Hub 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.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jetbrains Hub
Published: 2021-08-06
Last modified: 2026-06-17

Description

In JetBrains Hub before 2021.1.13262, a potentially insufficient CSP for the Widget deployment feature was used.

Frequently asked questions

What is CVE-2021-37540?: In JetBrains Hub before 2021.1.13262, a potentially insufficient CSP for the Widget deployment feature was used.
How severe is CVE-2021-37540?: CVE-2021-37540 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-37540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37540?: CVE-2021-37540 affects Jetbrains Hub. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-37540 published?: CVE-2021-37540 was published on 2021-08-06 and last updated on 2026-06-17.

References

https://blog.jetbrains.com/blog/2021/08/05/jetbrains-security-bulletin-q2-2021/

Affected products (1)

cpe:2.3:a:jetbrains:hub:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Hub

CVE-2026-50242 — Critical (CVSS 10.0): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429…
CVE-2026-56142 — Critical (CVSS 9.9): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429…
CVE-2026-56141 — Critical (CVSS 9.8): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429 account…
CVE-2022-25262 — Critical (CVSS 9.8): In JetBrains Hub before 2022.1.14434, SAML request takeover was possible.
CVE-2021-43183 — Critical (CVSS 9.8): In JetBrains Hub before 2021.1.13690, the authentication throttling mechanism could be bypassed.
CVE-2021-36209 — Critical (CVSS 9.8): In JetBrains Hub before 2021.1.13389, account takeover was possible during password reset.

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