Vulnerability-Lookup

ubuntu-cve-2021-23996

Vulnerability from osv_ubuntu

Published

2021-04-19 00:00

Modified

2026-04-22 07:39

Summary

Details

By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a user. This vulnerability affects Firefox < 88.

Severity

6.5 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-23996	REPORT
	https://www.mozilla.org/en-US/security/advisories…	REPORT
	https://ubuntu.com/security/notices/USN-4926-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-23996	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "88.0+build2-0ubuntu0.16.04.1"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "88.0+build2-0ubuntu0.16.04.1"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "88.0+build2-0ubuntu0.16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "88.0+build2-0ubuntu0.16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "41.0.2+build2-0ubuntu1",
        "42.0+build2-0ubuntu1",
        "44.0+build3-0ubuntu2",
        "44.0.1+build1-0ubuntu1",
        "44.0.2+build1-0ubuntu1",
        "45.0+build2-0ubuntu1",
        "45.0.1+build1-0ubuntu1",
        "45.0.2+build1-0ubuntu1",
        "46.0+build5-0ubuntu0.16.04.2",
        "46.0.1+build1-0ubuntu0.16.04.2",
        "47.0+build3-0ubuntu0.16.04.1",
        "48.0+build2-0ubuntu0.16.04.1",
        "49.0+build4-0ubuntu0.16.04.1",
        "49.0.2+build2-0ubuntu0.16.04.2",
        "50.0+build2-0ubuntu0.16.04.2",
        "50.0.2+build1-0ubuntu0.16.04.1",
        "50.1.0+build2-0ubuntu0.16.04.1",
        "51.0.1+build2-0ubuntu0.16.04.1",
        "51.0.1+build2-0ubuntu0.16.04.2",
        "52.0+build2-0ubuntu0.16.04.1",
        "52.0.1+build2-0ubuntu0.16.04.1",
        "52.0.2+build1-0ubuntu0.16.04.1",
        "53.0+build6-0ubuntu0.16.04.1",
        "53.0.2+build1-0ubuntu0.16.04.2",
        "53.0.3+build1-0ubuntu0.16.04.2",
        "54.0+build3-0ubuntu0.16.04.1",
        "55.0.1+build2-0ubuntu0.16.04.2",
        "55.0.2+build1-0ubuntu0.16.04.1",
        "56.0+build6-0ubuntu0.16.04.1",
        "56.0+build6-0ubuntu0.16.04.2",
        "57.0+build4-0ubuntu0.16.04.5",
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        "57.0.1+build2-0ubuntu0.16.04.1",
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        "77.0.1+build1-0ubuntu0.16.04.1",
        "78.0.1+build1-0ubuntu0.16.04.1",
        "78.0.2+build2-0ubuntu0.16.04.1",
        "79.0+build1-0ubuntu0.16.04.2",
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        "81.0.2+build1-0ubuntu0.16.04.1",
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        "85.0.1+build1-0ubuntu0.16.04.1",
        "86.0+build3-0ubuntu0.16.04.1",
        "86.0.1+build1-0ubuntu0.16.04.2",
        "87.0+build3-0ubuntu0.16.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "88.0+build2-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "88.0+build2-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "88.0+build2-0ubuntu0.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "88.0+build2-0ubuntu0.18.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "56.0+build6-0ubuntu1",
        "57.0.1+build2-0ubuntu1",
        "59.0.1+build1-0ubuntu1",
        "59.0.2+build1-0ubuntu1",
        "60.0+build2-0ubuntu1",
        "60.0.1+build2-0ubuntu0.18.04.1",
        "60.0.2+build1-0ubuntu0.18.04.1",
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        "61.0.1+build1-0ubuntu0.18.04.1",
        "62.0+build2-0ubuntu0.18.04.3",
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        "62.0.3+build1-0ubuntu0.18.04.1",
        "63.0+build2-0ubuntu0.18.04.2",
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      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-0ubuntu0.18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mozjs52",
        "purl": "pkg:deb/ubuntu/mozjs52@52.9.1-0ubuntu0.18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
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        "52.9.1-0ubuntu0.18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-38-0",
            "binary_version": "38.8.0~repack1-0ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mozjs38",
        "purl": "pkg:deb/ubuntu/mozjs38@38.8.0~repack1-0ubuntu4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "38.8.0~repack1-0ubuntu1",
        "38.8.0~repack1-0ubuntu3",
        "38.8.0~repack1-0ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "88.0+build2-0ubuntu0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
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        "70.0+build2-0ubuntu2",
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        "74.0+build2-0ubuntu1",
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        "87.0+build3-0ubuntu0.20.04.2"
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    },
    {
      "ecosystem_specific": {
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          {
            "binary_name": "libmozjs-68-0",
            "binary_version": "68.6.0-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "mozjs68",
        "purl": "pkg:deb/ubuntu/mozjs68@68.6.0-1ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "68.5.0-1~fakesync",
        "68.5.0-2~fakesync",
        "68.6.0-1",
        "68.6.0-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-1ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "mozjs52",
        "purl": "pkg:deb/ubuntu/mozjs52@52.9.1-1ubuntu3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "52.9.1-1build1",
        "52.9.1-1ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-78-0",
            "binary_version": "78.15.0-4ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mozjs78",
        "purl": "pkg:deb/ubuntu/mozjs78@78.15.0-4ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "78.13.0-1",
        "78.15.0-2",
        "78.15.0-4ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage\u0027s viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a user. This vulnerability affects Firefox \u003c 88.",
  "id": "UBUNTU-CVE-2021-23996",
  "modified": "2026-04-22T07:39:56Z",
  "published": "2021-04-19T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23996"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23996"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4926-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-23996"
    }
  ],
  "related": [
    "USN-4926-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-23996"
  ]
}

CVE-2021-23996 (GCVE-0-2021-23996)

Vulnerability from cvelistv5 – Published: 2021-06-24 13:25 – Updated: 2024-08-03 19:14

Summary

Severity

No CVSS data available.

CWE

Content rendered outside of webpage viewport

Assigner

mozilla mitre root

References

2 references

URL	Tags
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1701834	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Mozilla	Firefox	Affected: unspecified , < 88 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T19:14:10.063Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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usn-4926-1

Vulnerability from osv_ubuntu

Published

2021-04-26 10:44

Modified

2026-04-22 07:36

Summary

firefox vulnerabilities

Details

Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the browser UI, bypass security restrictions, trick the user into disclosing confidential information, or execute arbitrary code. (CVE-2021-23994, CVE-2021-23996, CVE-2021-23997, CVE-2021-23998, CVE-2021-23999, CVE-2021-24000, CVE-2021-24001, CVE-2021-29945, CVE-2021-29946, CVE-2021-29947)

A use-after-free was discovered when Responsive Design Mode was enabled. If a user were tricked into opening a specially crafted website with Responsive Design Mode enabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-23995)

It was discovered that Firefox mishandled ftp URLs with encoded newline characters. If a user were tricked into clicking on a specially crafted link, an attacker could potentially exploit this to send arbitrary FTP commands. (CVE-2021-24002)

References

URL

Type

	https://ubuntu.com/security/notices/USN-4926-1	ADVISORY
	https://ubuntu.com/security/CVE-2021-23994	REPORT
	https://ubuntu.com/security/CVE-2021-23995	REPORT
	https://ubuntu.com/security/CVE-2021-23996	REPORT
	https://ubuntu.com/security/CVE-2021-23997	REPORT
	https://ubuntu.com/security/CVE-2021-23998	REPORT
	https://ubuntu.com/security/CVE-2021-23999	REPORT
	https://ubuntu.com/security/CVE-2021-24000	REPORT
	https://ubuntu.com/security/CVE-2021-24001	REPORT
	https://ubuntu.com/security/CVE-2021-24002	REPORT
	https://ubuntu.com/security/CVE-2021-29945	REPORT
	https://ubuntu.com/security/CVE-2021-29946	REPORT
	https://ubuntu.com/security/CVE-2021-29947	REPORT

JSON

To clipboard

{
  "affected": [
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      "database_specific": {
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                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
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              "severity": [
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                  "type": "CVSS_V3"
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            {
              "id": "CVE-2021-23996",
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              "id": "CVE-2021-23998",
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "88.0+build2-0ubuntu0.18.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "56.0+build6-0ubuntu1",
        "57.0.1+build2-0ubuntu1",
        "59.0.1+build1-0ubuntu1",
        "59.0.2+build1-0ubuntu1",
        "60.0+build2-0ubuntu1",
        "60.0.1+build2-0ubuntu0.18.04.1",
        "60.0.2+build1-0ubuntu0.18.04.1",
        "61.0+build3-0ubuntu0.18.04.1",
        "61.0.1+build1-0ubuntu0.18.04.1",
        "62.0+build2-0ubuntu0.18.04.3",
        "62.0+build2-0ubuntu0.18.04.4",
        "62.0+build2-0ubuntu0.18.04.5",
        "62.0.3+build1-0ubuntu0.18.04.1",
        "63.0+build2-0ubuntu0.18.04.2",
        "63.0.3+build1-0ubuntu0.18.04.1",
        "64.0+build3-0ubuntu0.18.04.1",
        "65.0+build2-0ubuntu0.18.04.1",
        "65.0.1+build2-0ubuntu0.18.04.1",
        "66.0+build3-0ubuntu0.18.04.1",
        "66.0.1+build1-0ubuntu0.18.04.1",
        "66.0.2+build1-0ubuntu0.18.04.1",
        "66.0.3+build1-0ubuntu0.18.04.1",
        "66.0.4+build3-0ubuntu0.18.04.1",
        "66.0.5+build1-0ubuntu0.18.04.1",
        "67.0+build2-0ubuntu0.18.04.1",
        "67.0.1+build1-0ubuntu0.18.04.1",
        "67.0.2+build2-0ubuntu0.18.04.1",
        "67.0.3+build1-0ubuntu0.18.04.1",
        "67.0.4+build1-0ubuntu0.18.04.1",
        "68.0+build3-0ubuntu0.18.04.1",
        "68.0.1+build1-0ubuntu0.18.04.1",
        "68.0.2+build1-0ubuntu0.18.04.1",
        "69.0+build2-0ubuntu0.18.04.1",
        "69.0.1+build1-0ubuntu0.18.04.1",
        "69.0.2+build1-0ubuntu0.18.04.1",
        "70.0+build2-0ubuntu0.18.04.1",
        "70.0.1+build1-0ubuntu0.18.04.1",
        "71.0+build5-0ubuntu0.18.04.1",
        "72.0.1+build1-0ubuntu0.18.04.1",
        "72.0.2+build1-0ubuntu0.18.04.1",
        "73.0+build3-0ubuntu0.18.04.1",
        "73.0.1+build1-0ubuntu0.18.04.1",
        "74.0+build3-0ubuntu0.18.04.1",
        "74.0.1+build1-0ubuntu0.18.04.1",
        "75.0+build3-0ubuntu0.18.04.1",
        "76.0+build2-0ubuntu0.18.04.1",
        "76.0.1+build1-0ubuntu0.18.04.1",
        "77.0.1+build1-0ubuntu0.18.04.1",
        "78.0.1+build1-0ubuntu0.18.04.1",
        "78.0.2+build2-0ubuntu0.18.04.1",
        "79.0+build1-0ubuntu0.18.04.1",
        "80.0+build2-0ubuntu0.18.04.1",
        "80.0.1+build1-0ubuntu0.18.04.1",
        "81.0+build2-0ubuntu0.18.04.1",
        "81.0.2+build1-0ubuntu0.18.04.1",
        "82.0+build2-0ubuntu0.18.04.1",
        "82.0.2+build1-0ubuntu0.18.04.1",
        "82.0.3+build1-0ubuntu0.18.04.1",
        "83.0+build2-0ubuntu0.18.04.2",
        "84.0+build3-0ubuntu0.18.04.1",
        "84.0.1+build1-0ubuntu0.18.04.1",
        "84.0.2+build1-0ubuntu0.18.04.1",
        "85.0+build1-0ubuntu0.18.04.1",
        "85.0.1+build1-0ubuntu0.18.04.1",
        "86.0+build3-0ubuntu0.18.04.1",
        "86.0.1+build1-0ubuntu0.18.04.1",
        "87.0+build3-0ubuntu0.18.04.2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-23994",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23995",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23996",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23997",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23998",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23999",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-24000",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-24001",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-24002",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29945",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29946",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-29947",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "88.0+build2-0ubuntu0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "88.0+build2-0ubuntu0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "69.0.3+build1-0ubuntu1",
        "70.0+build2-0ubuntu1",
        "70.0+build2-0ubuntu2",
        "70.0.1+build1-0ubuntu2",
        "71.0+build2-0ubuntu2",
        "71.0+build5-0ubuntu1",
        "72.0.1+build1-0ubuntu1",
        "72.0.2+build1-0ubuntu1",
        "73.0+build1-0ubuntu1",
        "73.0+build2-0ubuntu1",
        "73.0+build3-0ubuntu1",
        "73.0.1+build1-0ubuntu1",
        "74.0+build1-0ubuntu1",
        "74.0+build2-0ubuntu1",
        "74.0+build2-0ubuntu2",
        "74.0+build3-0ubuntu1",
        "75.0+build3-0ubuntu1",
        "76.0+build2-0ubuntu0.20.04.1",
        "76.0.1+build1-0ubuntu0.20.04.1",
        "77.0.1+build1-0ubuntu0.20.04.1",
        "78.0.1+build1-0ubuntu0.20.04.1",
        "78.0.2+build2-0ubuntu0.20.04.1",
        "79.0+build1-0ubuntu0.20.04.1",
        "80.0+build2-0ubuntu0.20.04.1",
        "80.0.1+build1-0ubuntu0.20.04.1",
        "81.0+build2-0ubuntu0.20.04.1",
        "81.0.2+build1-0ubuntu0.20.04.1",
        "82.0+build2-0ubuntu0.20.04.1",
        "82.0.2+build1-0ubuntu0.20.04.1",
        "82.0.3+build1-0ubuntu0.20.04.1",
        "83.0+build2-0ubuntu0.20.04.1",
        "84.0+build3-0ubuntu0.20.04.1",
        "84.0.1+build1-0ubuntu0.20.04.1",
        "84.0.2+build1-0ubuntu0.20.04.1",
        "85.0+build1-0ubuntu0.20.04.1",
        "85.0.1+build1-0ubuntu0.20.04.1",
        "86.0+build3-0ubuntu0.20.04.1",
        "86.0.1+build1-0ubuntu0.20.04.1",
        "87.0+build3-0ubuntu0.20.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "Multiple security issues were discovered in Firefox. If a user were\ntricked into opening a specially crafted website, an attacker could\npotentially exploit these to cause a denial of service, spoof the\nbrowser UI, bypass security restrictions, trick the user into disclosing\nconfidential information, or execute arbitrary code. (CVE-2021-23994,\nCVE-2021-23996, CVE-2021-23997, CVE-2021-23998, CVE-2021-23999,\nCVE-2021-24000, CVE-2021-24001, CVE-2021-29945, CVE-2021-29946,\nCVE-2021-29947)\n\nA use-after-free was discovered when Responsive Design Mode was\nenabled. If a user were tricked into opening a specially crafted\nwebsite with Responsive Design Mode enabled, an attacker could\npotentially exploit this to cause a denial of service, or execute\narbitrary code. (CVE-2021-23995)\n\nIt was discovered that Firefox mishandled ftp URLs with encoded newline\ncharacters. If a user were tricked into clicking on a specially crafted\nlink, an attacker could potentially exploit this to send arbitrary\nFTP commands. (CVE-2021-24002)\n",
  "id": "USN-4926-1",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-04-26T10:44:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4926-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23994"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23995"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23996"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23997"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23998"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23999"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-24000"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-24001"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-24002"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29945"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29946"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29947"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "firefox vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-23994",
    "UBUNTU-CVE-2021-23995",
    "UBUNTU-CVE-2021-23996",
    "UBUNTU-CVE-2021-23997",
    "UBUNTU-CVE-2021-23998",
    "UBUNTU-CVE-2021-23999",
    "UBUNTU-CVE-2021-24000",
    "UBUNTU-CVE-2021-24001",
    "UBUNTU-CVE-2021-24002",
    "UBUNTU-CVE-2021-29945",
    "UBUNTU-CVE-2021-29946",
    "UBUNTU-CVE-2021-29947"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

ubuntu-cve-2021-23996

Vulnerability from osv_ubuntu

CVE-2021-23996 (GCVE-0-2021-23996)

usn-4926-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour