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CVE-2020-36444

25
FAUCET Score

CVE-2020-36444 describes a critical vulnerability in the async-coap Rust crate, specifically affecting versions through 2020-12-08, where the Send and Sync traits are incorrectly implemented for ArcGuard<RC, T> without proper trait bounds on RC. This flaw carries a high CVSS score of 8.1, indicating a network-based attack with high impact on confidentiality, integrity, and availability, though it requires high attack complexity. Despite its severity, there is no known active exploitation, publicly available exploit code, or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2020-12-08CPE matchmatch criteria
cpe:2.3:a:async-coap_project:async-coap:*:*:*:*:*: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
0.77%
Probability of exploitation in next 30 days
EPSS Percentile
51.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0077 is in the 20th percentile among its peer group of 8,918 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-9j8q-m9x5-9g6jhigh

Data races in async-coap

Aug 25, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/async-coap/RUSTSEC-2020-0124.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2020-0124.html
Third Party Advisory