NetScaler - Memory Disclosure (CVE-2025-5777)

CVE-2025-5777 is a vulnerability in NetScaler ADC and Gateway products that arises from insufficient input validation, leading to potential memory overread when configured as a Gateway or AAA virtual server. This flaw could allow attackers to access sensitive memory contents, potentially exposing confidential information or enabling further attacks such as information disclosure or system compromise.

CrowdSec has been tracking this vulnerability and its exploits since 7th of July 2025.

CrowdSec network data shows that most actors exploiting CVE-2025-5777 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2025-5777 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2025-5777 is currently experiencing high visibility and active exploitation across the internet.

Attackers exploit the Citrix NetScaler management interface by sending POST requests to /p/u/doAuthentication.do, attempting to trigger a memory disclosure vulnerability and extract sensitive information from server responses.