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CVE-2020-35905

17
FAUCET Score

CVE-2020-35905 describes a data race vulnerability in the futures-util crate (versions prior to 0.3.7) for Rust, specifically within the MutexGuard::map function when used with certain closures. This issue has a CVSS score of 4.7 (MEDIUM), indicating a local attack vector with high attack complexity, requiring low privileges, and primarily impacting availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.3.7CPE matchmatch criteria
cpe:2.3:a:rust-lang:future-utils:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

4.7MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.0
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 60th percentile among its peer group of 1,296 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: futures-utilFixed in: 0.3.7

Vendor Advisories (1)

rustGHSA-rh4w-94hh-9943medium

MutexGuard::map can cause a data race in safe code

May 24, 2022

References

rustsec.org / advisories/RUSTSEC-2020-0059.html
ExploitPatchThird Party Advisory