CVE-2023-6862: Use After Free
A use-after-free was identified in the nsDNSService::Init. This issue appears to manifest rarely during start-up.
External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/#CVE-2023-6862
Other sources
A use-after-free was identified in the nsDNSService::Init. This issue appears to manifest rarely during start-up. This vulnerability affects Firefox ESR < 115.6 and Thunderbird < 115.6.
— MITRE
A use-after-free was identified in the nsDNSService::Init. This issue appears to manifest rarely during start-up.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 115.14.0esr-1~deb11u1Fixed in 128.9.0esr-1~deb11u1Fixed in 128.8.0esr-1~deb12u1Fixed in 128.9.0esr-1~deb12u1Fixed in 128.9.0esr-2 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:115.12.0-1~deb11u1Fixed in 1:128.9.0esr-1~deb11u1Fixed in 1:128.8.0esr-1~deb12u1Fixed in 1:128.9.0esr-1~deb12u1Fixed in 1:128.9.0esr-1 - Upgrade
Upgrade
redhat/firefoxto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
redhat/thunderbirdto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 115.6.0-r0
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2023-6862?
CVE-2023-6862 is a use-after-free vulnerability that impacts Mozilla Firefox ESR and Thunderbird versions prior to 115.6.
How do I fix CVE-2023-6862?
To mitigate CVE-2023-6862, update Mozilla Firefox ESR and Thunderbird to version 115.6 or later.
What products are affected by CVE-2023-6862?
CVE-2023-6862 affects Mozilla Firefox ESR and Thunderbird prior to version 115.6.
Where can CVE-2023-6862 be exploited?
CVE-2023-6862 can potentially be exploited during the startup phase of the affected applications.
Is CVE-2023-6862 a critical vulnerability?
While CVE-2023-6862 has potential implications for security, it is classified as a less frequently exploited use-after-free vulnerability.