How severe is CVE-2020-35886?

CVE-2020-35886 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35886 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35886?

CVE-2020-35886 affects Arr Project Arr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35886?

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

When was CVE-2020-35886 published?

CVE-2020-35886 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2020-35886

CVE-2020-35886 is a medium-severity vulnerability in Arr Project Arr with a CVSS 3.x base score of 4.7. 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-362.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v2: 1.9
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-362
Affected product: Arr Project Arr
Published: 2020-12-31
Last modified: 2026-06-17

Description

An issue was discovered in the arr crate through 2020-08-25 for Rust. An attacker can smuggle non-Sync/Send types across a thread boundary to cause a data race.

Frequently asked questions

What is CVE-2020-35886?: An issue was discovered in the arr crate through 2020-08-25 for Rust. An attacker can smuggle non-Sync/Send types across a thread boundary to cause a data race.
How severe is CVE-2020-35886?: CVE-2020-35886 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35886 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35886?: CVE-2020-35886 affects Arr Project Arr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35886?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35886 published?: CVE-2020-35886 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2020-0034.html

Affected products (1)

cpe:2.3:a:arr_project:arr:*:*:*:*:*:rust:*:*

More vulnerabilities in Arr Project Arr

CVE-2020-35888 — Critical (CVSS 9.8): An issue was discovered in the arr crate through 2020-08-25 for Rust. Uninitialized memory is dropped by…
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