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Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it

CVE-2025-7776 is a high-severity memory overflow vulnerability classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) affecting Citrix NetScaler ADC and NetScaler Gateway products. Specifically, the flaw manifests when NetScaler is configured as a Gateway—such as VPN virtual server, ICA Proxy, CVPN, or RDP Proxy—with a PCoIP Profile bound to it. The vulnerability arises from improper handling of memory buffers, which can lead to memory overflow conditions. This can cause unpredictable or erroneous behavior including denial of service (DoS) conditions. The affected versions include NetScaler ADC versions 14.1, 13.1 (including FIPS and NDcPP variants), and 12.1 (FIPS and NDcPP). The vulnerability is remotely exploitable without authentication or user interaction, as indicated by the CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:N). The impact on confidentiality and integrity is low, but availability impact is high due to potential DoS. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in mid-July 2025 and published in late August 2025, indicating recent discovery and disclosure. Given the critical role of NetScaler ADC and Gateway appliances in enterprise network infrastructure—especially for secure remote access and application delivery—this vulnerability poses a significant risk to organizations relying on these products for VPN and proxy services.

Detailed information about CVE-2025-7776: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC affecting NetScaler A

CVE-2025-7776: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-7776: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC

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