CVE-2023-6859: Use After Free
A use-after-free condition affected TLS socket creation when under memory pressure.
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
Firefoxto a version that resolves this vulnerability.Fixed in 121 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 138.0.1-1 - 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 128.10.0esr-1~deb12u1Fixed in 128.9.0esr-2Fixed in 128.10.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:115.12.0-1~deb11u1Fixed in 1:128.10.0esr-1~deb11u1Fixed in 1:128.8.0esr-1~deb12u1Fixed in 1:128.10.0esr-1~deb12u1Fixed in 1:128.9.0esr-1Fixed in 1:128.10.0esr-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
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-2023-6859?
CVE-2023-6859 has been classified as a high severity vulnerability due to its potential to allow an attacker to exploit a use-after-free condition.
How do I fix CVE-2023-6859?
To fix CVE-2023-6859, update Mozilla Firefox or Thunderbird to version 115.6 or later.
What software is affected by CVE-2023-6859?
CVE-2023-6859 affects Mozilla Firefox ESR and Thunderbird versions prior to 115.6, as well as certain versions of Firefox up to 121.
What does a use-after-free vulnerability like CVE-2023-6859 entail?
A use-after-free vulnerability like CVE-2023-6859 occurs when a program continues to use a pointer after the memory it points to has been freed, leading to potential memory corruption.
Can CVE-2023-6859 be exploited remotely?
Yes, CVE-2023-6859 can potentially be exploited remotely if a user is misled into loading a malicious site that triggers the vulnerability.