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CVE-2021-38193

21
FAUCET Score

CVE-2021-38193 is a Cross-Site Scripting (XSS) vulnerability affecting the ammonia crate for Rust, versions prior to 3.1.0, stemming from mishandled parsing differences across HTML, SVG, and MathML. This vulnerability has a CVSS score of 6.1 (Medium), indicating it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to low impact on confidentiality and integrity. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.1.0CPE matchmatch criteria
cpe:2.3:a:ammonia_project:ammonia:*:*:*:*:*: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
0.71%
Probability of exploitation in next 30 days
EPSS Percentile
49.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0071 is in the 55th 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 (2)

rustpatch availablevia ghsa
Product: ammoniaFixed in: 3.1.0
rustpatch availablevia ghsa
Product: ammoniaFixed in: 2.1.3

Vendor Advisories (1)

rustGHSA-5325-xw5m-phm3medium

Cross-site Scripting in ammonia

Aug 25, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/ammonia/RUSTSEC-2021-0074.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0074.html
ExploitIssue TrackingPatchThird Party Advisory