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CVE-2020-35902

30
FAUCET Score

CVE-2020-35902 is a critical use-after-free vulnerability (CWE-416) affecting the actix-codec crate before version 0.3.0-beta.1, which is used in Rust applications. With a CVSS score of 9.8, this vulnerability allows for remote, low-complexity attacks without user interaction, potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.2.0CPE matchmatch criteria
cpe:2.3:a:actix:actix-codec:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.63%
Probability of exploitation in next 30 days
EPSS Percentile
73.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0163 is in the 61st percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: actix-codecFixed in: 0.3.0

Vendor Advisories (1)

rustGHSA-rqgx-hpg4-456rcritical

Use-after-free in actix-codec

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2020-0049.html
ExploitThird Party Advisory