CVE-2021-38500: High severity Mozilla Thunderbird vulnerability
Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Other sources
Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs present in Thunderbird 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 118.0.2-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 91.12.0esr-1~deb10u1Fixed in 115.3.1esr-1~deb10u1Fixed in 102.15.0esr-1~deb11u1Fixed in 115.3.1esr-1~deb11u1Fixed in 102.15.1esr-1~deb12u1Fixed in 115.3.0esr-1~deb12u1Fixed in 115.3.0esr-1Fixed in 115.4.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:91.12.0-1~deb10u1Fixed in 1:115.3.1-1~deb10u1Fixed in 1:102.13.1-1~deb11u1Fixed in 1:115.3.1-1~deb11u1Fixed in 1:102.15.1-1~deb12u1Fixed in 1:115.3.1-1~deb12u1Fixed in 1:115.3.1-1 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 91.2 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 93 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 91.2 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 78.15 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 93.0-r0 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 78.15.0-r0 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 91.2.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 93.0-r0 - Upgrade
Upgrade
alpine/mozjs78to a version that resolves this vulnerability.Fixed in 78.15.0-r0 - Upgrade
Upgrade
alpine/thunderbirdto a version that resolves this vulnerability.Fixed in 91.3.2-r0
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID is CVE-2021-38500.
What is the severity of CVE-2021-38500?
The severity of CVE-2021-38500 is high with a severity score of 8.8.
Which software is affected by CVE-2021-38500?
Firefox versions up to and excluding 93, Firefox ESR versions up to and excluding 78.15, and Thunderbird versions up to and excluding 78.15 are affected by CVE-2021-38500.
How can I fix CVE-2021-38500?
Updating to Firefox version 93, Firefox ESR version 78.15, or Thunderbird version 78.15 will fix CVE-2021-38500.
Where can I find more information about CVE-2021-38500?
You can find more information about CVE-2021-38500 at the following references: [Mozilla Bugzilla](https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321), [Mozilla Security Advisories](https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/), [Debian LTS Announcement](https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html).