How severe is CVE-2021-4435?

CVE-2021-4435 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-4435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4435?

CVE-2021-4435 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4435?

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.

Does CVE-2021-4435 have an EU (EUVD) identifier?

Yes. CVE-2021-4435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0674.

When was CVE-2021-4435 published?

CVE-2021-4435 was published on 2024-02-04 and last updated on 2026-06-17.

CVE-2021-4435

CVE-2021-4435 is a high-severity vulnerability in Yarnpkg Yarn with a CVSS 3.x base score of 7.7. 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-426.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-0674
Weakness: CWE-426
Affected product: Yarnpkg Yarn
Published: 2024-02-04
Last modified: 2026-06-17

Description

An untrusted search path vulnerability was found in Yarn. When a victim runs certain Yarn commands in a directory with attacker-controlled content, malicious commands could be executed in unexpected ways.

Frequently asked questions

What is CVE-2021-4435?: An untrusted search path vulnerability was found in Yarn. When a victim runs certain Yarn commands in a directory with attacker-controlled content, malicious commands could be executed in unexpected ways.
How severe is CVE-2021-4435?: CVE-2021-4435 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-4435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4435?: CVE-2021-4435 affects Yarnpkg Yarn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4435?: 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.
Does CVE-2021-4435 have an EU (EUVD) identifier?: Yes. CVE-2021-4435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-0674.
When was CVE-2021-4435 published?: CVE-2021-4435 was published on 2024-02-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yarnpkg:yarn:*:*:*:*:*:*:*:*

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