CVE-2023-6858: Buffer Overflow
Firefox was susceptible to a heap buffer overflow in nsTextFragment due to insufficient OOM handling.
External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/#CVE-2023-6858
Other sources
Firefox was susceptible to a heap buffer overflow in nsTextFragment due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
— Launchpad
Firefox was susceptible to a heap buffer overflow in nsTextFragment due to insufficient OOM handling.
— Mozilla
Thunderbird was susceptible to a heap buffer overflow in nsTextFragment due to insufficient OOM handling.
— Mozilla
Affected Software
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-2023-6858?
CVE-2023-6858 is a critical vulnerability due to a heap buffer overflow in Firefox.
How do I fix CVE-2023-6858?
To fix CVE-2023-6858, upgrade Firefox or Thunderbird to version 115.6 or later.
Which versions of Firefox are affected by CVE-2023-6858?
CVE-2023-6858 affects Firefox versions prior to 115.6.
Is CVE-2023-6858 applicable to Thunderbird as well?
Yes, CVE-2023-6858 also affects Thunderbird prior to version 115.6.
What kind of impact does CVE-2023-6858 have if exploited?
If exploited, CVE-2023-6858 could allow remote attackers to execute arbitrary code.