CVE-2021-23998: Medium severity Mozilla Thunderbird vulnerability
Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page.
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 78.10 - Upgrade
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Firefoxto a version that resolves this vulnerability.Fixed in 88 - Upgrade
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Firefox ESRto a version that resolves this vulnerability.Fixed in 78.10 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 88.0-r0 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 78.10.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 88.0-r0 - Upgrade
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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 severity of CVE-2021-23998?
CVE-2021-23998 has a moderate severity rating as it can mislead users by displaying a secure lock icon on an insecure HTTP page.
How do I fix CVE-2021-23998?
To fix CVE-2021-23998, upgrade to Mozilla Thunderbird or Firefox ESR version 78.10 or later.
Which versions are affected by CVE-2021-23998?
CVE-2021-23998 affects Mozilla Thunderbird versions prior to 78.10 and Mozilla Firefox ESR versions prior to 78.10.
What is the impact of CVE-2021-23998 on users?
The impact of CVE-2021-23998 is that it can create a false sense of security for users by displaying a secure lock symbol on an unsecured HTTP page.
Is CVE-2021-23998 exploitable remotely?
CVE-2021-23998 is potentially exploitable remotely as it arises from the way new windows handle navigation between secure and insecure content.