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CVE-2020-36458

25
FAUCET Score

CVE-2020-36458 describes a concurrency issue (CWE-362) in the Rust 'lexer' crate, specifically affecting versions through 2020-11-10, where the ReaderResult type incorrectly implements Sync with Send trait bounds. This vulnerability carries a CVSS score of 8.1 (HIGH), indicating that it can be exploited remotely with high impact on confidentiality, integrity, and availability, despite requiring high attack complexity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, suggesting a low immediate threat.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2020-11-10CPE matchmatch criteria
cpe:2.3:a:lexer_project:lexer:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.83%
Probability of exploitation in next 30 days
EPSS Percentile
53.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0083 is in the 21st percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 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

Vendor Advisories (1)

rustGHSA-f997-8gxg-r354high

Data races in lexer

Aug 25, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/lexer/RUSTSEC-2020-0138.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2020-0138.html
ExploitIssue TrackingPatchThird Party Advisory