PatchTheCVECVE-2021-38193: An issue was discovered in the ammonia crate before 3.1.0 for Rust
CVE-2021-38193 is a medium-severity flaw (CVSS 6.1) affecting ammonia. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the ammonia crate before 3.1.0 for Rust. XSS can occur because the parsing differences for HTML, SVG, and MathML are mishandled, a similar issue to CVE-2020-26870.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.7% (top 47%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-08-08 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-38193?
ammonia: upgrade to 3.1.0. Exact commands for each OS are on this page.
Is CVE-2021-38193 being exploited?
CVE-2021-38193 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-38193 affect?
CVE-2021-38193 affects ammonia. Severity is medium (CVSS 6.1). An issue was discovered in the ammonia crate before 3.1.0 for Rust. XSS can occur because the parsing differences for HTML, SVG, and MathML are mishandled, a similar issue to CVE-2020-26870.
How urgent is CVE-2021-38193?
Priority 40/100. Public exploit reference
Related CVEs
- CVE-2019-15542 HIGH 7.5 UPGRADE An issue was discovered in the ammonia crate before 2.1.0 for Rust