Citrix - RCE (CVE-2021-22941)

CVE-2021-22941 is an improper access control vulnerability in Citrix ShareFile storage zones controller that could allow unauthenticated remote compromise.

CrowdSec has been tracking this vulnerability and its exploits since 15th of December 2023.

CrowdSec network observations suggest that most exploitation of CVE-2021-22941 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2021-22941 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2021-22941 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attempts to exploit this vulnerability often involve requests to endpoints containing /upload.aspx.