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Two high-severity vulnerabilities, identified as CVE-2025-5349 and CVE-2025-5777, have been discovered in Citrix NetScaler ADC and NetScaler Gateway products. According to a Citrix advisory released on June 17, 2025, these flaws pose a significant risk to organizations using the affected products. It is strongly recommended that users update their systems as soon as possible to mitigate potential exploits. These vulnerabilities affect NetScaler ADC and NetScaler Gateway versions 14.1 before 14.1-43.56, 13.1 before 13.1-58.32, 13.1-FIPS and NDcPP before 13.1-37.235-FIPS and NDcPP, and 12.1-FIPS before 12.1-55.328-FIPS. Note that versions 12.1 and 13.0 are End Of Life (EOL) and are also vulnerable.
CVE-2025-5777, which has a CVSS score of 9.3, stems from insufficient input validation, leading to a memory overread. This vulnerability is only exploitable when NetScaler is configured as a Gateway, encompassing VPN virtual servers, ICA Proxy, CVPN, or RDP Proxy, or when configured as an AAA virtual server. CVE-2025-5349, with a CVSS score of 8.7, is attributed to improper access control on the NetScaler Management Interface. Exploitation of this vulnerability requires the attacker to have access to the NSIP address, the Cluster Management IP, or the local GSLB Site IP. The National Vulnerability Database provides additional detail on both CVE-2025-5349 and CVE-2025-5777. To address these vulnerabilities, Citrix advises upgrading to the latest versions of NetScaler ADC and NetScaler Gateway. Additionally, after upgrading all NetScaler appliances in a high availability (HA) pair or cluster to the fixed builds, Citrix recommends executing the following commands to terminate all active ICA and PCoIP sessions: `kill icaconnection -all` and `kill pcoipConnection -all`. CERT-In has also issued an advisory regarding these vulnerabilities. Further information regarding the impact on businesses can be found on Cyberexpress.
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