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CVE-2020-35858

29
FAUCET Score

CVE-2020-35858 is a critical denial-of-service vulnerability affecting the prost crate for Rust, specifically versions prior to 0.6.1. A crafted message can lead to stack consumption, causing a denial of service on platforms like x86, and potentially remote code execution on ARM systems. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low attack complexity and no user interaction required, leading to high impacts on confidentiality, integrity, and availability. Currently, there is no public exploit code available (Metasploit, Nuclei, ExploitDB), and it has not been added to CISA's KEV catalog, nor is there any significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.1CPE matchmatch criteria
cpe:2.3:a:prost_project:prost:*:*:*:*:*: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
3.26%
Probability of exploitation in next 30 days
EPSS Percentile
87.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0326 is in the 79th 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: prostFixed in: 0.6.1

Vendor Advisories (1)

rustGHSA-gv73-9mwv-fwgqcritical

Out of bounds write in prost

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2020-0002.html
ExploitPatchThird Party Advisory