How severe is CVE-2020-35889?

CVE-2020-35889 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-35889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35889?

CVE-2020-35889 affects Crayon Project Crayon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35889?

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-2020-35889 published?

CVE-2020-35889 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2020-35889

CVE-2020-35889 is a high-severity vulnerability in Crayon Project Crayon with a CVSS 3.x base score of 8.1. 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-367.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-367
Affected product: Crayon Project Crayon
Published: 2020-12-31
Last modified: 2026-06-17

Description

An issue was discovered in the crayon crate through 2020-08-31 for Rust. A TOCTOU issue has a resultant memory safety violation via HandleLike.

Frequently asked questions

What is CVE-2020-35889?: An issue was discovered in the crayon crate through 2020-08-31 for Rust. A TOCTOU issue has a resultant memory safety violation via HandleLike.
How severe is CVE-2020-35889?: CVE-2020-35889 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-35889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35889?: CVE-2020-35889 affects Crayon Project Crayon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35889?: 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-2020-35889 published?: CVE-2020-35889 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2020-0037.html

Affected products (1)

cpe:2.3:a:crayon_project:crayon:*:*:*:*:*:rust:*:*

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