ubuntu-cve-2021-4020
Vulnerability from osv_ubuntu
Published
2021-11-27 10:15
Modified
2026-04-22 07:39
Summary
Details

janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Severity
8.8 (High)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "janus",
            "binary_version": "0.2.6-1build2"
          },
          {
            "binary_name": "janus-demos",
            "binary_version": "0.2.6-1build2"
          },
          {
            "binary_name": "janus-tools",
            "binary_version": "0.2.6-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "janus",
        "purl": "pkg:deb/ubuntu/janus@0.2.6-1build2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.4-2",
        "0.2.5-1",
        "0.2.6-1",
        "0.2.6-1build1",
        "0.2.6-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "janus",
            "binary_version": "0.7.3-2build1"
          },
          {
            "binary_name": "janus-demos",
            "binary_version": "0.7.3-2build1"
          },
          {
            "binary_name": "janus-tools",
            "binary_version": "0.7.3-2build1"
          },
          {
            "binary_name": "libjs-janus",
            "binary_version": "0.7.3-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "janus",
        "purl": "pkg:deb/ubuntu/janus@0.7.3-2build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.7.3-2",
        "0.7.3-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "janus",
            "binary_version": "0.11.8-3"
          },
          {
            "binary_name": "janus-demos",
            "binary_version": "0.11.8-3"
          },
          {
            "binary_name": "janus-tools",
            "binary_version": "0.11.8-3"
          },
          {
            "binary_name": "libjs-janus",
            "binary_version": "0.11.8-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "janus",
        "purl": "pkg:deb/ubuntu/janus@0.11.8-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.2-1",
        "0.11.5-1",
        "0.11.5-1ubuntu1",
        "0.11.5-3",
        "0.11.5-4",
        "0.11.6-1",
        "0.11.7-1",
        "0.11.8-1",
        "0.11.8-2",
        "0.11.8-3"
      ]
    }
  ],
  "aliases": [],
  "details": "janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
  "id": "UBUNTU-CVE-2021-4020",
  "modified": "2026-04-22T07:39:50Z",
  "published": "2021-11-27T10:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4020"
    },
    {
      "type": "REPORT",
      "url": "https://huntr.dev/bounties/9814baa8-7bdd-4e31-a132-d9d15653409e/"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/meetecho/janus-gateway/commit/ba166e9adebfe5343f826c6a9e02299d35414ffd"
    },
    {
      "type": "REPORT",
      "url": "https://huntr.dev/bounties/9814baa8-7bdd-4e31-a132-d9d15653409e"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/meetecho/janus-gateway/commit/d3fc00ec803d6c41d8f98908732f44e7f4911a1c"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4020"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4020"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.