How severe is CVE-2020-35865?

CVE-2020-35865 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35865 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35865?

CVE-2020-35865 affects Os Str Bytes Project Os Str Bytes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35865?

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-2020-35865 published?

CVE-2020-35865 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2020-35865

CVE-2020-35865 is a high-severity vulnerability in Os Str Bytes Project Os Str Bytes 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Os Str Bytes Project Os Str Bytes
Published: 2020-12-31
Last modified: 2026-06-17

Description

An issue was discovered in the os_str_bytes crate before 2.0.0 for Rust. It has false expectations about char::from_u32_unchecked behavior.

Frequently asked questions

What is CVE-2020-35865?: An issue was discovered in the os_str_bytes crate before 2.0.0 for Rust. It has false expectations about char::from_u32_unchecked behavior.
How severe is CVE-2020-35865?: CVE-2020-35865 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35865 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35865?: CVE-2020-35865 affects Os Str Bytes Project Os Str Bytes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35865?: 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-2020-35865 published?: CVE-2020-35865 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2020-0012.html

Affected products (1)

cpe:2.3:a:os_str_bytes_project:os_str_bytes:*:*:*:*:*:rust:*:*