Security advisory

{
  "id": "1cf76d3182a3e766c03d92d75e09bb11280929b94bd37cada14cf65bc1ba44fd",
  "url": "https://osv.dev/vulnerability/CVE-2021-3377",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3377",
    "summary": "The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient URL sanitization, this feature is affected by a cross-site scripting (XSS) vulnerability. This issue is fixed in v5.0.0.",
    "evidence": "osv:CVE-2021-3377",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-3377",
      "aliases": [
        "CVE-2021-3377",
        "GHSA-2v5f-23xc-v9qr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/drudru/ansi_up",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c8c726ed1db979bae4f257b7fa41775155ba2e27"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ansi_up_project:ansi_up:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c8c726ed1db979bae4f257b7fa41775155ba2e27"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.0.4",
            "v4.0.3",
            "v3.0.0",
            "v2.0.2",
            "2.0.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3377.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:48.347109649Z",
      "provider": "osv",
      "references": [
        "https://security.netapp.com/advisory/ntap-20241108-0002/",
        "https://github.com/drudru/ansi_up/commit/c8c726ed1db979bae4f257b7fa41775155ba2e27",
        "https://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdf"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3377",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384649,
  "published_at": "2021-03-05T21:15:13.263+00:00"
}