UBUNTU-CVE-2021-43535
- Source
- https://ubuntu.com/security/CVE-2021-43535
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43535.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-43535
- Upstream
- Downstream
- Related
- Published
- 2021-12-08T22:15:00Z
- Modified
- 2025-09-08T16:47:24Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
- References
-
- https://ubuntu.com/security/CVE-2021-43535
- https://www.mozilla.org/security/advisories/mfsa2021-50/
- https://www.mozilla.org/security/advisories/mfsa2021-43/
- https://www.mozilla.org/security/advisories/mfsa2021-49/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667102
- https://ubuntu.com/security/notices/USN-5248-1
- https://www.cve.org/CVERecord?id=CVE-2021-43535
Affected packages
Ubuntu:18.04:LTS / thunderbird
Package
- Name
- thunderbird
- Purl
- pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.18.04.1?arch=source&distro=bionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1:91.5.0+build1-0ubuntu0.18.04.1
Affected versions
1:52.*
1:52.4.0+build1-0ubuntu2
1:52.6.0+build1-0ubuntu1
1:52.7.0+build1-0ubuntu1
1:52.8.0+build1-0ubuntu0.18.04.1
1:52.9.1+build3-0ubuntu0.18.04.1
1:60.*
1:60.2.1+build1-0ubuntu0.18.04.2
1:60.4.0+build2-0ubuntu0.18.04.1
1:60.5.1+build2-0ubuntu0.18.04.1
1:60.6.1+build2-0ubuntu0.18.04.1
1:60.7.0+build1-0ubuntu0.18.04.1
1:60.7.1+build1-0ubuntu0.18.04.1
1:60.7.2+build2-0ubuntu0.18.04.1
1:60.8.0+build1-0ubuntu0.18.04.1
1:60.9.0+build1-0ubuntu0.18.04.1
1:68.*
1:68.2.1+build1-0ubuntu0.18.04.1
1:68.2.2+build1-0ubuntu0.18.04.1
1:68.4.1+build1-0ubuntu0.18.04.1
1:68.7.0+build1-0ubuntu0.18.04.1
1:68.8.0+build2-0ubuntu0.18.04.2
1:68.10.0+build1-0ubuntu0.18.04.1
1:78.*
1:78.8.1+build1-0ubuntu0.18.04.1
1:78.11.0+build1-0ubuntu0.18.04.2
1:78.13.0+build1-0ubuntu0.18.04.1
1:78.14.0+build1-0ubuntu0.18.04.1
1:78.14.0+build1-0ubuntu0.18.04.2
Ecosystem specific
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "thunderbird",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "thunderbird-dev",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "thunderbird-gnome-support",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "thunderbird-mozsymbols",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-calendar-timezones",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-gdata-provider",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-lightning",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
}
]
}
Ubuntu:20.04:LTS / thunderbird
Package
- Name
- thunderbird
- Purl
- pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.20.04.1?arch=source&distro=focal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1:91.5.0+build1-0ubuntu0.20.04.1
Affected versions
1:68.*
1:68.1.2+build1-0ubuntu1
1:68.1.2+build1-0ubuntu2
1:68.2.1+build1-0ubuntu1
1:68.2.2+build1-0ubuntu1
1:68.3.0+build2-0ubuntu1
1:68.3.1+build1-0ubuntu2
1:68.4.1+build1-0ubuntu1
1:68.4.2+build2-0ubuntu1
1:68.5.0+build1-0ubuntu1
1:68.6.0+build2-0ubuntu1
1:68.7.0+build1-0ubuntu1
1:68.7.0+build1-0ubuntu2
1:68.8.0+build2-0ubuntu0.20.04.2
1:68.10.0+build1-0ubuntu0.20.04.1
1:78.*
1:78.7.1+build1-0ubuntu0.20.04.1
1:78.8.1+build1-0ubuntu0.20.04.1
1:78.11.0+build1-0ubuntu0.20.04.2
1:78.13.0+build1-0ubuntu0.20.04.2
1:78.14.0+build1-0ubuntu0.20.04.1
1:78.14.0+build1-0ubuntu0.20.04.2
Ecosystem specific
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "thunderbird",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "thunderbird-dev",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "thunderbird-gnome-support",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "thunderbird-mozsymbols",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "xul-ext-calendar-timezones",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "xul-ext-gdata-provider",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
},
{
"binary_name": "xul-ext-lightning",
"binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
}
]
}