USN-4756-1
- Source
- https://ubuntu.com/security/notices/USN-4756-1
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4756-1.json
- JSON Data
- https://api.osv.dev/v1/vulns/USN-4756-1
- Upstream
- Related
- Published
- 2021-02-26T18:11:10.077093Z
- Modified
- 2025-10-13T04:35:23Z
- 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, conduct cross-site scripting (XSS) attacks, bypass HTTP auth phishing warnings, or execute arbitrary code.
- References
-
- https://ubuntu.com/security/notices/USN-4756-1
- https://ubuntu.com/security/CVE-2021-23968
- https://ubuntu.com/security/CVE-2021-23969
- https://ubuntu.com/security/CVE-2021-23970
- https://ubuntu.com/security/CVE-2021-23971
- https://ubuntu.com/security/CVE-2021-23972
- https://ubuntu.com/security/CVE-2021-23973
- https://ubuntu.com/security/CVE-2021-23974
- https://ubuntu.com/security/CVE-2021-23975
- https://ubuntu.com/security/CVE-2021-23978
- https://ubuntu.com/security/CVE-2021-23979
Affected packages
Ubuntu:16.04:LTS / firefox
Package
- Name
- firefox
- Purl
- pkg:deb/ubuntu/firefox@86.0+build3-0ubuntu0.16.04.1?arch=source&distro=xenial
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed86.0+build3-0ubuntu0.16.04.1
Affected versions
41.*
41.0.2+build2-0ubuntu1
42.*
42.0+build2-0ubuntu1
44.*
44.0+build3-0ubuntu2
44.0.1+build1-0ubuntu1
44.0.2+build1-0ubuntu1
45.*
45.0+build2-0ubuntu1
45.0.1+build1-0ubuntu1
45.0.2+build1-0ubuntu1
46.*
46.0+build5-0ubuntu0.16.04.2
46.0.1+build1-0ubuntu0.16.04.2
47.*
47.0+build3-0ubuntu0.16.04.1
48.*
48.0+build2-0ubuntu0.16.04.1
49.*
49.0+build4-0ubuntu0.16.04.1
49.0.2+build2-0ubuntu0.16.04.2
50.*
50.0+build2-0ubuntu0.16.04.2
50.0.2+build1-0ubuntu0.16.04.1
50.1.0+build2-0ubuntu0.16.04.1
51.*
51.0.1+build2-0ubuntu0.16.04.1
51.0.1+build2-0ubuntu0.16.04.2
52.*
52.0+build2-0ubuntu0.16.04.1
52.0.1+build2-0ubuntu0.16.04.1
52.0.2+build1-0ubuntu0.16.04.1
53.*
53.0+build6-0ubuntu0.16.04.1
53.0.2+build1-0ubuntu0.16.04.2
53.0.3+build1-0ubuntu0.16.04.2
54.*
54.0+build3-0ubuntu0.16.04.1
55.*
55.0.1+build2-0ubuntu0.16.04.2
55.0.2+build1-0ubuntu0.16.04.1
56.*
56.0+build6-0ubuntu0.16.04.1
56.0+build6-0ubuntu0.16.04.2
57.*
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
57.0.4+build1-0ubuntu0.16.04.1
58.*
58.0+build6-0ubuntu0.16.04.1
58.0.1+build1-0ubuntu0.16.04.1
58.0.2+build1-0ubuntu0.16.04.1
59.*
59.0+build5-0ubuntu0.16.04.1
59.0.1+build1-0ubuntu0.16.04.1
59.0.2+build1-0ubuntu0.16.04.1
59.0.2+build1-0ubuntu0.16.04.3
60.*
60.0+build2-0ubuntu0.16.04.1
60.0.1+build2-0ubuntu0.16.04.1
60.0.2+build1-0ubuntu0.16.04.1
61.*
61.0+build3-0ubuntu0.16.04.2
61.0.1+build1-0ubuntu0.16.04.1
62.*
62.0+build2-0ubuntu0.16.04.3
62.0+build2-0ubuntu0.16.04.4
62.0+build2-0ubuntu0.16.04.5
62.0.3+build1-0ubuntu0.16.04.2
63.*
63.0+build2-0ubuntu0.16.04.2
63.0.3+build1-0ubuntu0.16.04.1
64.*
64.0+build3-0ubuntu0.16.04.1
65.*
65.0+build2-0ubuntu0.16.04.1
65.0.1+build2-0ubuntu0.16.04.1
66.*
66.0+build3-0ubuntu0.16.04.2
66.0.1+build1-0ubuntu0.16.04.1
66.0.2+build1-0ubuntu0.16.04.1
66.0.3+build1-0ubuntu0.16.04.1
66.0.4+build3-0ubuntu0.16.04.1
66.0.5+build1-0ubuntu0.16.04.1
67.*
67.0+build2-0ubuntu0.16.04.1
67.0.1+build1-0ubuntu0.16.04.1
67.0.2+build2-0ubuntu0.16.04.1
67.0.3+build1-0ubuntu0.16.04.1
67.0.4+build1-0ubuntu0.16.04.1
68.*
68.0+build3-0ubuntu0.16.04.1
68.0.1+build1-0ubuntu0.16.04.1
68.0.2+build1-0ubuntu0.16.04.1
69.*
69.0+build2-0ubuntu0.16.04.4
69.0.1+build1-0ubuntu0.16.04.1
69.0.2+build1-0ubuntu0.16.04.1
70.*
70.0+build2-0ubuntu0.16.04.1
70.0.1+build1-0ubuntu0.16.04.1
71.*
71.0+build5-0ubuntu0.16.04.1
72.*
72.0.1+build1-0ubuntu0.16.04.1
72.0.2+build1-0ubuntu0.16.04.1
73.*
73.0.1+build1-0ubuntu0.16.04.1
74.*
74.0+build3-0ubuntu0.16.04.1
74.0.1+build1-0ubuntu0.16.04.1
75.*
75.0+build3-0ubuntu0.16.04.1
76.*
76.0+build2-0ubuntu0.16.04.1
76.0.1+build1-0ubuntu0.16.04.1
77.*
77.0.1+build1-0ubuntu0.16.04.1
78.*
78.0.1+build1-0ubuntu0.16.04.1
78.0.2+build2-0ubuntu0.16.04.1
79.*
79.0+build1-0ubuntu0.16.04.2
80.*
80.0+build2-0ubuntu0.16.04.1
80.0.1+build1-0ubuntu0.16.04.1
81.*
81.0+build2-0ubuntu0.16.04.1
81.0.2+build1-0ubuntu0.16.04.1
82.*
82.0+build2-0ubuntu0.16.04.5
82.0.2+build1-0ubuntu0.16.04.1
82.0.3+build1-0ubuntu0.16.04.1
83.*
83.0+build2-0ubuntu0.16.04.3
84.*
84.0+build3-0ubuntu0.16.04.1
84.0.1+build1-0ubuntu0.16.04.1
84.0.2+build1-0ubuntu0.16.04.1
85.*
85.0+build1-0ubuntu0.16.04.1
85.0.1+build1-0ubuntu0.16.04.1
Ecosystem specific
{
"binaries": [
{
"binary_version": "86.0+build3-0ubuntu0.16.04.1",
"binary_name": "firefox"
},
{
"binary_version": "86.0+build3-0ubuntu0.16.04.1",
"binary_name": "firefox-dev"
},
{
"binary_version": "86.0+build3-0ubuntu0.16.04.1",
"binary_name": "firefox-geckodriver"
},
{
"binary_version": "86.0+build3-0ubuntu0.16.04.1",
"binary_name": "firefox-mozsymbols"
}
],
"availability": "No subscription required"
}
Database specific
cves_map
{
"ecosystem": "Ubuntu:16.04:LTS",
"cves": [
{
"id": "CVE-2021-23968",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23969",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23970",
"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-2021-23971",
"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-2021-23972",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23973",
"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-2021-23974",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23975",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23978",
"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-2021-23979",
"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"
}
]
}
]
}
Ubuntu:18.04:LTS / firefox
Package
- Name
- firefox
- Purl
- pkg:deb/ubuntu/firefox@86.0+build3-0ubuntu0.18.04.1?arch=source&distro=bionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed86.0+build3-0ubuntu0.18.04.1
Affected versions
56.*
56.0+build6-0ubuntu1
57.*
57.0.1+build2-0ubuntu1
59.*
59.0.1+build1-0ubuntu1
59.0.2+build1-0ubuntu1
60.*
60.0+build2-0ubuntu1
60.0.1+build2-0ubuntu0.18.04.1
60.0.2+build1-0ubuntu0.18.04.1
61.*
61.0+build3-0ubuntu0.18.04.1
61.0.1+build1-0ubuntu0.18.04.1
62.*
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.*
63.0+build2-0ubuntu0.18.04.2
63.0.3+build1-0ubuntu0.18.04.1
64.*
64.0+build3-0ubuntu0.18.04.1
65.*
65.0+build2-0ubuntu0.18.04.1
65.0.1+build2-0ubuntu0.18.04.1
66.*
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.*
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.*
68.0+build3-0ubuntu0.18.04.1
68.0.1+build1-0ubuntu0.18.04.1
68.0.2+build1-0ubuntu0.18.04.1
69.*
69.0+build2-0ubuntu0.18.04.1
69.0.1+build1-0ubuntu0.18.04.1
69.0.2+build1-0ubuntu0.18.04.1
70.*
70.0+build2-0ubuntu0.18.04.1
70.0.1+build1-0ubuntu0.18.04.1
71.*
71.0+build5-0ubuntu0.18.04.1
72.*
72.0.1+build1-0ubuntu0.18.04.1
72.0.2+build1-0ubuntu0.18.04.1
73.*
73.0+build3-0ubuntu0.18.04.1
73.0.1+build1-0ubuntu0.18.04.1
74.*
74.0+build3-0ubuntu0.18.04.1
74.0.1+build1-0ubuntu0.18.04.1
75.*
75.0+build3-0ubuntu0.18.04.1
76.*
76.0+build2-0ubuntu0.18.04.1
76.0.1+build1-0ubuntu0.18.04.1
77.*
77.0.1+build1-0ubuntu0.18.04.1
78.*
78.0.1+build1-0ubuntu0.18.04.1
78.0.2+build2-0ubuntu0.18.04.1
79.*
79.0+build1-0ubuntu0.18.04.1
80.*
80.0+build2-0ubuntu0.18.04.1
80.0.1+build1-0ubuntu0.18.04.1
81.*
81.0+build2-0ubuntu0.18.04.1
81.0.2+build1-0ubuntu0.18.04.1
82.*
82.0+build2-0ubuntu0.18.04.1
82.0.2+build1-0ubuntu0.18.04.1
82.0.3+build1-0ubuntu0.18.04.1
83.*
83.0+build2-0ubuntu0.18.04.2
84.*
84.0+build3-0ubuntu0.18.04.1
84.0.1+build1-0ubuntu0.18.04.1
84.0.2+build1-0ubuntu0.18.04.1
85.*
85.0+build1-0ubuntu0.18.04.1
85.0.1+build1-0ubuntu0.18.04.1
Ecosystem specific
{
"binaries": [
{
"binary_version": "86.0+build3-0ubuntu0.18.04.1",
"binary_name": "firefox"
},
{
"binary_version": "86.0+build3-0ubuntu0.18.04.1",
"binary_name": "firefox-dev"
},
{
"binary_version": "86.0+build3-0ubuntu0.18.04.1",
"binary_name": "firefox-geckodriver"
},
{
"binary_version": "86.0+build3-0ubuntu0.18.04.1",
"binary_name": "firefox-mozsymbols"
}
],
"availability": "No subscription required"
}
Database specific
cves_map
{
"ecosystem": "Ubuntu:18.04:LTS",
"cves": [
{
"id": "CVE-2021-23968",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23969",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23970",
"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-2021-23971",
"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-2021-23972",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23973",
"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-2021-23974",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23975",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23978",
"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-2021-23979",
"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"
}
]
}
]
}
Ubuntu:20.04:LTS / firefox
Package
- Name
- firefox
- Purl
- pkg:deb/ubuntu/firefox@86.0+build3-0ubuntu0.20.04.1?arch=source&distro=focal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed86.0+build3-0ubuntu0.20.04.1
Affected versions
69.*
69.0.3+build1-0ubuntu1
70.*
70.0+build2-0ubuntu1
70.0+build2-0ubuntu2
70.0.1+build1-0ubuntu2
71.*
71.0+build2-0ubuntu2
71.0+build5-0ubuntu1
72.*
72.0.1+build1-0ubuntu1
72.0.2+build1-0ubuntu1
73.*
73.0+build1-0ubuntu1
73.0+build2-0ubuntu1
73.0+build3-0ubuntu1
73.0.1+build1-0ubuntu1
74.*
74.0+build1-0ubuntu1
74.0+build2-0ubuntu1
74.0+build2-0ubuntu2
74.0+build3-0ubuntu1
75.*
75.0+build3-0ubuntu1
76.*
76.0+build2-0ubuntu0.20.04.1
76.0.1+build1-0ubuntu0.20.04.1
77.*
77.0.1+build1-0ubuntu0.20.04.1
78.*
78.0.1+build1-0ubuntu0.20.04.1
78.0.2+build2-0ubuntu0.20.04.1
79.*
79.0+build1-0ubuntu0.20.04.1
80.*
80.0+build2-0ubuntu0.20.04.1
80.0.1+build1-0ubuntu0.20.04.1
81.*
81.0+build2-0ubuntu0.20.04.1
81.0.2+build1-0ubuntu0.20.04.1
82.*
82.0+build2-0ubuntu0.20.04.1
82.0.2+build1-0ubuntu0.20.04.1
82.0.3+build1-0ubuntu0.20.04.1
83.*
83.0+build2-0ubuntu0.20.04.1
84.*
84.0+build3-0ubuntu0.20.04.1
84.0.1+build1-0ubuntu0.20.04.1
84.0.2+build1-0ubuntu0.20.04.1
85.*
85.0+build1-0ubuntu0.20.04.1
85.0.1+build1-0ubuntu0.20.04.1
Ecosystem specific
{
"binaries": [
{
"binary_version": "86.0+build3-0ubuntu0.20.04.1",
"binary_name": "firefox"
},
{
"binary_version": "86.0+build3-0ubuntu0.20.04.1",
"binary_name": "firefox-dev"
},
{
"binary_version": "86.0+build3-0ubuntu0.20.04.1",
"binary_name": "firefox-geckodriver"
},
{
"binary_version": "86.0+build3-0ubuntu0.20.04.1",
"binary_name": "firefox-mozsymbols"
}
],
"availability": "No subscription required"
}
Database specific
cves_map
{
"ecosystem": "Ubuntu:20.04:LTS",
"cves": [
{
"id": "CVE-2021-23968",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23969",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23970",
"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-2021-23971",
"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-2021-23972",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23973",
"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-2021-23974",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23975",
"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": "low",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-23978",
"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-2021-23979",
"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"
}
]
}
]
}