High Threat Security Alert (A21-10-03): Multiple Vulnerabilities in Apache HTTP Server

Description:

The Apache Software Foundation released a security update to address multiple vulnerabilities in the HTTP Server and its modules. The issues affect only Apache 2.4.49 and not earlier versions. A remote attacker could exploit the vulnerabilities by sending a specially crafted request to the affected systems.

Reports indicate that the vulnerability (CVE-2021-41773) is being exploited in the wild.  You are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Apache HTTP Server version 2.4.49

Impact:

Depending on the vulnerability exploited, a successful exploitation could lead to denial of service, information disclosure or security restriction bypass on an affected system.

Recommendation:

The Apache Software Foundation has released new version of the product to address the issues and they can be downloaded at the following URL:

https://httpd.apache.org/download.cgi#apache24

More Information:

• https://httpd.apache.org/download.cgi#apache24
• https://httpd.apache.org/security/vulnerabilities_24.html#2.4.50
• https://www.hkcert.org/security-bulletin/apache-http-multiple-vulnerabilities_20210920
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41524
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41773