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CVE-2021-38186

21
FAUCET Score

CVE-2021-38186 describes a Cross-Site Scripting (XSS) vulnerability in the comrak crate for Rust, specifically versions prior to 0.10.1, due to improper handling of '&' characters when processing '&# HTML entities. This medium-severity vulnerability (CVSS 6.1) can be exploited remotely with low attack complexity, requiring user interaction, and could lead to low impact on confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.10.1CPE matchmatch criteria
cpe:2.3:a:comrak_project:comrak:*:*:*:*:*: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
0.74%
Probability of exploitation in next 30 days
EPSS Percentile
50.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0074 is in the 57th percentile among its peer group of 26,221 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: comrakFixed in: 0.10.1

Vendor Advisories (1)

rustGHSA-6wj2-g87r-pm62medium

Cross-site Scripting in comrak

Aug 25, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/comrak/RUSTSEC-2021-0063.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0063.html
ExploitIssue TrackingPatchThird Party Advisory