USN-4926-1

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Please try reporting it to the source first.
Source
https://ubuntu.com/security/notices/USN-4926-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4926-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4926-1
Upstream
Related
Published
2021-04-26T10:44:42.282509Z
Modified
2025-09-08T16:37:00Z
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

Affected packages

Ubuntu:16.04:LTS / firefox

Package

Name
firefox
Purl
pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.16.04.1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
88.0+build2-0ubuntu0.16.04.1

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

86.*

86.0+build3-0ubuntu0.16.04.1
86.0.1+build1-0ubuntu0.16.04.2

87.*

87.0+build3-0ubuntu0.16.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "88.0+build2-0ubuntu0.16.04.1",
            "binary_name": "firefox"
        },
        {
            "binary_version": "88.0+build2-0ubuntu0.16.04.1",
            "binary_name": "firefox-dev"
        },
        {
            "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"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:18.04:LTS / firefox

Package

Name
firefox
Purl
pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.18.04.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
88.0+build2-0ubuntu0.18.04.2

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

86.*

86.0+build3-0ubuntu0.18.04.1
86.0.1+build1-0ubuntu0.18.04.1

87.*

87.0+build3-0ubuntu0.18.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "88.0+build2-0ubuntu0.18.04.2",
            "binary_name": "firefox"
        },
        {
            "binary_version": "88.0+build2-0ubuntu0.18.04.2",
            "binary_name": "firefox-dev"
        },
        {
            "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"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:20.04:LTS / firefox

Package

Name
firefox
Purl
pkg:deb/ubuntu/firefox@88.0+build2-0ubuntu0.20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
88.0+build2-0ubuntu0.20.04.1

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

86.*

86.0+build3-0ubuntu0.20.04.1
86.0.1+build1-0ubuntu0.20.04.1

87.*

87.0+build3-0ubuntu0.20.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "88.0+build2-0ubuntu0.20.04.1",
            "binary_name": "firefox"
        },
        {
            "binary_version": "88.0+build2-0ubuntu0.20.04.1",
            "binary_name": "firefox-dev"
        },
        {
            "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"
        }
    ],
    "availability": "No subscription required"
}