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.

Data from the CrowdSec community indicates that exploitation of CVE-2021-22941 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2021-22941. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

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