How severe is CVE-2020-35895?

CVE-2020-35895 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-35895 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35895?

CVE-2020-35895 affects Stack Project Stack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35895?

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

When was CVE-2020-35895 published?

CVE-2020-35895 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2020-35895

CVE-2020-35895 is a critical-severity vulnerability in Stack Project Stack with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Stack Project Stack
Published: 2020-12-31
Last modified: 2026-06-17

Description

An issue was discovered in the stack crate before 0.3.1 for Rust. ArrayVec has an out-of-bounds write via element insertion.

Frequently asked questions

What is CVE-2020-35895?: An issue was discovered in the stack crate before 0.3.1 for Rust. ArrayVec has an out-of-bounds write via element insertion.
How severe is CVE-2020-35895?: CVE-2020-35895 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-35895 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35895?: CVE-2020-35895 affects Stack Project Stack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35895?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-35895 published?: CVE-2020-35895 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2020-0042.html

Affected products (1)

cpe:2.3:a:stack_project:stack:*:*:*:*:*:rust:*:*

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