Apache · Apache Http Server · CVE-2021-39275
**Name of the Vulnerable Software and Affected Versions**
Apache HTTP Server versions prior to 2.4.49
**Description**
The `ap escape quotes()` function contains a flaw where it may write beyond the end of a buffer when processing malicious input. While no included modules pass untrusted data to this function, third-party or external modules may do so. This could allow a remote attacker to access confidential data, compromise data integrity, or cause a denial of service.
**Recommendations**
Update to version 2.4.49 or later.
Restrict the use of third-party modules that pass untrusted data to the `ap escape quotes()` function.