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Apache Server - Remote Code Execution (CVE-2021-42013)

CVSSv3 Score
Vulnerability description

Apache server is affected by a Remote Code Execution vulnerability, located on the /cgi-bin endpoint. If CGI (mod-cgi) has been explicitly enabled on the server and files outside the document root are not protected with the "require all denied" configuration, an unauthenticated remote attacker can access arbitrary binaries from the file system (ex. /bin/sh) and execute commands on the server. The root cause of this vulnerability consists in a change done to the path normalization code in 2.4.49-2.4.50 versions of Apache Server. Only this specific versions are affected.

Risk description

The risk exists that a remote unauthenticated attacker can fully compromise the server in order to steal confidential information, install ransomware or pivot to the internal network.

Exploit capabilities

Sniper can gain unauthenticated Remote Code Execution on the target system and extract multiple artefacts as evidence.


Upgrade the Apache server to a version equal or higher than 2.4.51.

Not available
Detectable with
Network Scanner
Exploitable with Sniper
Vuln date
Oct 2021
Published at
Updated at
Software Type
Web server