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CVE-2020-35865

23
FAUCET Score

CVE-2020-35865 is a high-severity vulnerability (CVSS 7.5) affecting the os_str_bytes crate for Rust, specifically versions prior to 2.0.0. The issue stems from incorrect assumptions regarding the behavior of char::from_u32_unchecked, which could lead to a denial of service. The vulnerability is network-exploitable with low attack complexity and no user interaction required, but it currently lacks public exploit code, active exploitation, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.0CPE matchmatch criteria
cpe:2.3:a:os_str_bytes_project:os_str_bytes:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.34%
Probability of exploitation in next 30 days
EPSS Percentile
68.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0134 is in the 48th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: os_str_bytesFixed in: 2.0.0

Vendor Advisories (1)

rustGHSA-q948-x8rf-888mhigh

os_str_bytes relies on undefined behavior of `char::from_u32_unchecked`

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2020-0012.html
PatchThird Party Advisory