Vulnerability-Lookup

ubuntu-cve-2021-23986

Vulnerability from osv_ubuntu

Published

2021-03-25 00:00

Modified

2026-04-22 07:39

Summary

Details

A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87.

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-23986	REPORT
	https://www.mozilla.org/en-US/security/advisories…	REPORT
	https://ubuntu.com/security/notices/USN-4893-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-23986	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "87.0+build3-0ubuntu0.16.04.2"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "87.0+build3-0ubuntu0.16.04.2"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "87.0+build3-0ubuntu0.16.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@87.0+build3-0ubuntu0.16.04.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "87.0+build3-0ubuntu0.16.04.2"
            }
          ],
          "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",
        "57.0+build4-0ubuntu0.16.04.6",
        "57.0.1+build2-0ubuntu0.16.04.1",
        "57.0.3+build1-0ubuntu0.16.04.1",
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        "62.0+build2-0ubuntu0.16.04.4",
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        "66.0+build3-0ubuntu0.16.04.2",
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        "67.0.3+build1-0ubuntu0.16.04.1",
        "67.0.4+build1-0ubuntu0.16.04.1",
        "68.0+build3-0ubuntu0.16.04.1",
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        "71.0+build5-0ubuntu0.16.04.1",
        "72.0.1+build1-0ubuntu0.16.04.1",
        "72.0.2+build1-0ubuntu0.16.04.1",
        "73.0.1+build1-0ubuntu0.16.04.1",
        "74.0+build3-0ubuntu0.16.04.1",
        "74.0.1+build1-0ubuntu0.16.04.1",
        "75.0+build3-0ubuntu0.16.04.1",
        "76.0+build2-0ubuntu0.16.04.1",
        "76.0.1+build1-0ubuntu0.16.04.1",
        "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",
        "80.0+build2-0ubuntu0.16.04.1",
        "80.0.1+build1-0ubuntu0.16.04.1",
        "81.0+build2-0ubuntu0.16.04.1",
        "81.0.2+build1-0ubuntu0.16.04.1",
        "82.0+build2-0ubuntu0.16.04.5",
        "82.0.2+build1-0ubuntu0.16.04.1",
        "82.0.3+build1-0ubuntu0.16.04.1",
        "83.0+build2-0ubuntu0.16.04.3",
        "84.0+build3-0ubuntu0.16.04.1",
        "84.0.1+build1-0ubuntu0.16.04.1",
        "84.0.2+build1-0ubuntu0.16.04.1",
        "85.0+build1-0ubuntu0.16.04.1",
        "85.0.1+build1-0ubuntu0.16.04.1",
        "86.0+build3-0ubuntu0.16.04.1",
        "86.0.1+build1-0ubuntu0.16.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "firefox",
            "binary_version": "87.0+build3-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "87.0+build3-0ubuntu0.18.04.2"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "87.0+build3-0ubuntu0.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@87.0+build3-0ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "87.0+build3-0ubuntu0.18.04.2"
            }
          ],
          "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",
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        "68.0.1+build1-0ubuntu0.18.04.1",
        "68.0.2+build1-0ubuntu0.18.04.1",
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        "69.0.1+build1-0ubuntu0.18.04.1",
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        "70.0.1+build1-0ubuntu0.18.04.1",
        "71.0+build5-0ubuntu0.18.04.1",
        "72.0.1+build1-0ubuntu0.18.04.1",
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        "73.0+build3-0ubuntu0.18.04.1",
        "73.0.1+build1-0ubuntu0.18.04.1",
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        "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",
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        "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",
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        "86.0+build3-0ubuntu0.18.04.1",
        "86.0.1+build1-0ubuntu0.18.04.1"
      ]
    },
    {
      "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": [
        "52.3.1-0ubuntu3",
        "52.3.1-7fakesync1",
        "52.8.1-0ubuntu0.18.04.1",
        "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": "87.0+build3-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "87.0+build3-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "87.0+build3-0ubuntu0.20.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@87.0+build3-0ubuntu0.20.04.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "87.0+build3-0ubuntu0.20.04.2"
            }
          ],
          "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"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "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": "A malicious extension with the \u0027search\u0027 permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox \u003c 87.",
  "id": "UBUNTU-CVE-2021-23986",
  "modified": "2026-04-22T07:39:56Z",
  "published": "2021-03-25T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23986"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23986"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4893-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-23986"
    }
  ],
  "related": [
    "USN-4893-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-23986"
  ]
}

CVE-2021-23986 (GCVE-0-2021-23986)

Vulnerability from cvelistv5 – Published: 2021-03-31 13:41 – Updated: 2024-08-03 19:14

Summary

Severity

No CVSS data available.

CWE

A malicious extension could have performed credential-less same origin policy violations

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=1692623	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Mozilla	Firefox	Affected: unspecified , < 87 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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}

usn-4893-1

Vulnerability from osv_ubuntu

Published

2021-03-25 22:36

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, obtain sensitive information, or execute arbitrary code. (CVE-2021-23981, CVE-2021-23982, CVE-2021-23983, CVE-2021-23987, CVE-2021-23988)

It was discovered that extensions could open popup windows with control of the window title in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to spook a website and trick the user into providing credentials. (CVE-2021-23984)

It was discovered that the DevTools remote debugging feature could be enabled without an indication to the user. If a local attacker could modify the browser configuration, a remote attacker could potentially exploit this to obtain sensitive information. (CVE-2021-23985)

It was discovered that extensions could read the response of cross origin requests in some circumstances. If a user were tricked into installing a specially crafted extension, an attacker could potentially exploit this to obtain sensitive information. (CVE-2021-23986)

References

URL

Type

	https://ubuntu.com/security/notices/USN-4893-1	ADVISORY
	https://ubuntu.com/security/CVE-2021-23981	REPORT
	https://ubuntu.com/security/CVE-2021-23982	REPORT
	https://ubuntu.com/security/CVE-2021-23983	REPORT
	https://ubuntu.com/security/CVE-2021-23984	REPORT
	https://ubuntu.com/security/CVE-2021-23985	REPORT
	https://ubuntu.com/security/CVE-2021-23986	REPORT
	https://ubuntu.com/security/CVE-2021-23987	REPORT
	https://ubuntu.com/security/CVE-2021-23988	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
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              "id": "CVE-2021-23981",
              "severity": [
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23982",
              "severity": [
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
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            },
            {
              "id": "CVE-2021-23983",
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                },
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                }
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            {
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        }
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        "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-23981",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23982",
              "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-2021-23983",
              "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-2021-23984",
              "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-2021-23985",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23986",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-23987",
              "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-2021-23988",
              "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": "87.0+build3-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "firefox-geckodriver",
            "binary_version": "87.0+build3-0ubuntu0.20.04.2"
          },
          {
            "binary_name": "firefox-mozsymbols",
            "binary_version": "87.0+build3-0ubuntu0.20.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "firefox",
        "purl": "pkg:deb/ubuntu/firefox@87.0+build3-0ubuntu0.20.04.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "87.0+build3-0ubuntu0.20.04.2"
            }
          ],
          "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"
      ]
    }
  ],
  "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, obtain sensitive\ninformation, or execute arbitrary code. (CVE-2021-23981, CVE-2021-23982,\nCVE-2021-23983, CVE-2021-23987, CVE-2021-23988)\n\nIt was discovered that extensions could open popup windows with control\nof the window title in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to spook a website and trick the user into providing\ncredentials. (CVE-2021-23984)\n\nIt was discovered that the DevTools remote debugging feature could be\nenabled without an indication to the user. If a local attacker could\nmodify the browser configuration, a remote attacker could potentially\nexploit this to obtain sensitive information. (CVE-2021-23985)\n\nIt was discovered that extensions could read the response of cross\norigin requests in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to obtain sensitive information. (CVE-2021-23986)\n",
  "id": "USN-4893-1",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-03-25T22:36:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4893-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23981"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23982"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23983"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23984"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23985"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23986"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23987"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-23988"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "firefox vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-23981",
    "UBUNTU-CVE-2021-23982",
    "UBUNTU-CVE-2021-23983",
    "UBUNTU-CVE-2021-23984",
    "UBUNTU-CVE-2021-23985",
    "UBUNTU-CVE-2021-23986",
    "UBUNTU-CVE-2021-23987",
    "UBUNTU-CVE-2021-23988"
  ]
}

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-2021-23986

Vulnerability from osv_ubuntu

CVE-2021-23986 (GCVE-0-2021-23986)

usn-4893-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour