Vulnerability-Lookup

ubuntu-cve-2021-23997

Vulnerability from osv_ubuntu

Published

2021-04-19 00:00

Modified

2026-04-22 07:39

Summary

Details

Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.

Severity

8.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-23997	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-2021-23997	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",
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      ]
    },
    {
      "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",
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    },
    {
      "ecosystem_specific": {
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          {
            "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"
            }
          ],
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        }
      ],
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        "52.3.1-7fakesync1",
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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": [
            {
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            }
          ],
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        }
      ],
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        "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": [
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          "events": [
            {
              "introduced": "0"
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            {
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            }
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        "87.0+build3-0ubuntu0.20.04.2"
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    {
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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": [
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          "type": "ECOSYSTEM"
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      ],
      "versions": [
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        "68.5.0-2~fakesync",
        "68.6.0-1",
        "68.6.0-1ubuntu1"
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    },
    {
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        "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": "Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003c 88.",
  "id": "UBUNTU-CVE-2021-23997",
  "modified": "2026-04-22T07:39:56Z",
  "published": "2021-04-19T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23997"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23997"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4926-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-23997"
    }
  ],
  "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:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-23997"
  ]
}

CVE-2021-23997 (GCVE-0-2021-23997)

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

Summary

Severity

No CVSS data available.

CWE

Use-after-free when freeing fonts from cache

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=1701942	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": "2024-08-03T19:14:10.062Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
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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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              "id": "CVE-2021-23994",
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                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
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            },
            {
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              "severity": [
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                  "type": "CVSS_V3"
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              "id": "CVE-2021-23996",
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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-2021-23997

Vulnerability from osv_ubuntu

CVE-2021-23997 (GCVE-0-2021-23997)

usn-4926-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour