How severe is CVE-2021-21420?

CVE-2021-21420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21420?

CVE-2021-21420 affects Stripe. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-21420 published?

CVE-2021-21420 was published on 2021-04-01 and last updated on 2026-06-17.

CVE-2021-21420

CVE-2021-21420 is a high-severity vulnerability in Stripe with a CVSS 3.x base score of 7.5. 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-74.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 6.8
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Stripe
Published: 2021-04-01
Last modified: 2026-06-17

Description

vscode-stripe is an extension for Visual Studio Code. A vulnerability in Stripe for Visual Studio Code extension exists when it loads an untrusted source-code repository containing malicious settings. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. The update addresses the vulnerability by modifying the way the extension validates its settings.

Frequently asked questions

What is CVE-2021-21420?: vscode-stripe is an extension for Visual Studio Code. A vulnerability in Stripe for Visual Studio Code extension exists when it loads an untrusted source-code repository containing malicious settings. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. The update addresses the vulnerability by modifying the way the extension validates its settings.
How severe is CVE-2021-21420?: CVE-2021-21420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21420?: CVE-2021-21420 affects Stripe. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-21420 published?: CVE-2021-21420 was published on 2021-04-01 and last updated on 2026-06-17.

References

https://github.com/stripe/vscode-stripe/security/advisories/GHSA-j6x4-4622-8vv3

Affected products (1)

cpe:2.3:a:stripe:stripe:*:*:*:*:*:visual_studio_code:*:*

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