Apache · Apache Http Server · CVE-2021-39275
**Name of the Vulnerable Software and Affected Versions**
Apache HTTP Server versions 2.4.48 and earlier
**Description**
The issue is related to the `ap escape quotes()` function, which may write beyond the end of a buffer when given malicious input. Although no included modules pass untrusted data to these functions, third-party or external modules may. This could allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service.
**Recommendations**
For Apache HTTP Server versions 2.4.48 and earlier, consider disabling the `ap escape quotes()` function until a patch is available to prevent potential buffer overflow issues. Additionally, restrict the use of third-party or external modules that may pass untrusted data to this function to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.