CVE-2021-23973: Medium severity Mozilla Thunderbird vulnerability
When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource.
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-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 78.8 - Upgrade
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Firefoxto a version that resolves this vulnerability.Fixed in 86 - Upgrade
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Firefox ESRto a version that resolves this vulnerability.Fixed in 78.8 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 87.0-r0 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 78.8.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 87.0-r0 - Upgrade
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alpine/thunderbirdto a version that resolves this vulnerability.Fixed in 78.9.0-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 severity of CVE-2021-23973?
The severity of CVE-2021-23973 is considered moderate, focusing on decoding errors in cross-origin resources.
How do I fix CVE-2021-23973?
To fix CVE-2021-23973, update Firefox, Firefox ESR, or Thunderbird to the latest patched version available.
Which versions are affected by CVE-2021-23973?
CVE-2021-23973 affects multiple versions of Firefox, Firefox ESR, and Thunderbird before their respective patched releases.
What types of products are affected by CVE-2021-23973?
CVE-2021-23973 impacts Mozilla products including Firefox, Firefox ESR, and Thunderbird.
What is the nature of the vulnerability in CVE-2021-23973?
CVE-2021-23973 is a vulnerability related to potential information disclosure from decoding errors when loading cross-origin resources.