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CVE-2021-38193

Status: ModifiedMedium (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.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Ammonia Project — Ammonia

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-38193",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
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        "cvssData": {
          "scope": "CHANGED",
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          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
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        },
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  "affected": [
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          "versions": [
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              "status": "affected",
              "version": "n/a"
            }
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  ],
  "published": "2021-08-08T06:15:09.043",
  "references": [
    {
      "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ammonia/RUSTSEC-2021-0074.md",
      "tags": [
        "Third Party Advisory"
      ],
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        "Third Party Advisory"
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ammonia/RUSTSEC-2021-0074.md",
      "tags": [
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0074.html",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en la crate ammonia versiones anteriores a 3.1.0 para Rust. Un ataque de tipo XSS puede ocurrir porque las diferencias de análisis para HTML, SVG y MathML son manejadas inapropiadamente, un problema similar a CVE-2020-26870"
    }
  ],
  "lastModified": "2026-06-17T04:01:43.997",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "3.1.0"
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          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}