On October 7, 2021, the Apache Software Foundation released Apache HTTP Server version 2.4.51 to address Path Traversal and Remote Code Execution vulnerabilities (CVE-2021-41773, CVE-2021-42013) in Apache HTTP Server 2.4.49 and 2.4.50. These vulnerabilities have been exploited in the wild.
CISA is also seeing ongoing scanning of vulnerable systems, which is expected to accelerate, likely leading to exploitation. CISA urges organizations to patch immediately if they haven’t already—this cannot wait until after the holiday weekend.