The vulnerability, tracked as CVE-2025-5777, has been added to CISA’s Known Exploited Vulnerabilities (KEV) catalog with an immediate remediation deadline of July 11, 2025. The vulnerability specifically affects deployments where NetScaler functions as a Gateway with VPN virtual server configurations, ICA Proxy services, CVPN implementations, or RDP Proxy setups. Out-of-bounds read vulnerability (CWE-125) affects Gateway and AAA virtual server configurations, causing memory overread. In cases where effective mitigations are unavailable or cannot be implemented promptly, CISA recommends discontinuing use of the affected products until proper security measures can be established. CISA warns of actively exploited CVE-2025-5777 vulnerability in Citrix NetScaler ADC and Gateway products. According to CISA’s advisory, this vulnerability is categorized under CWE-125 (Out-of-bounds Read), which represents a class of software weaknesses where programs read data past the end or before the beginning of the intended buffer. Organizations utilizing affected Citrix NetScaler products face immediate exposure to potential data breaches and system infiltration. CISA has established an aggressive remediation timeline, requiring federal agencies to address the vulnerability by July 11, 2025. The technical impact of CVE-2025-5777 manifests as memory overread conditions when NetScaler systems are configured in specific operational modes. The out-of-bounds read condition can potentially allow malicious actors to access sensitive memory contents, potentially leading to information disclosure or system compromise. The agency recommends implementing vendor-provided mitigations as the primary response strategy, with specific guidance available through Citrix’s official support documentation.
This Cyber News was published on cybersecuritynews.com. Publication date: Sat, 12 Jul 2025 02:40:11 +0000