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CVE-2020-36202

19
FAUCET Score

CVE-2020-36202 describes a request smuggling vulnerability in the async-h1 crate for Rust, affecting versions prior to 2.3.0, specifically when deployed behind a reverse proxy. This medium-severity vulnerability (CVSS 6.1) has a low attack complexity and could lead to partial confidentiality and integrity impacts, but does not affect availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.3.0CPE matchmatch criteria
cpe:2.3:a:rust-lang:async-h1:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.81%
Probability of exploitation in next 30 days
EPSS Percentile
53.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0081 is in the 62nd percentile among its peer group of 26,219 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: async-h1Fixed in: 2.3.0

Vendor Advisories (1)

rustGHSA-c8rq-crxj-mj9mmedium

Async-h1 request smuggling possible with long unread bodies

May 24, 2022

References

rustsec.org / advisories/RUSTSEC-2020-0093.html
PatchVendor Advisory