Unraid - RCE (CVE-2020-5847)

CVE-2020-5847 is a critical vulnerability in Unraid through version 6.8.0 that allows remote code execution. This flaw enables attackers to execute arbitrary commands on the affected system without authentication, potentially leading to full system compromise and unauthorized access to sensitive data.

CrowdSec has been tracking this vulnerability and its exploits since 8th of April 2026.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2020-5847 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. In addition, according to the CrowdSec network, attack volume against CVE-2020-5847 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

Attackers exploit this vulnerability by sending crafted requests to URLs containing /webGui/images/green-on.png with malicious PHP code injected via the site[x][text] parameter, enabling remote code execution on UnRaid servers.