A critical out-of-bounds read vulnerability in Citrix NetScaler systems poses significant risks to enterprise infrastructure. The vulnerability affects ADC and Gateway appliances, potentially enabling unauthorized access and system compromise.
A newly disclosed vulnerability (CVE-2026-3055) affecting Citrix NetScaler ADC and Gateway appliances has been identified and classified as critical. The vulnerability stems from an out-of-bounds read condition that could allow attackers to gain unauthorized access to sensitive information and potentially compromise affected systems. Given Citrix NetScaler's widespread deployment in enterprise environments for application delivery and security, this vulnerability presents a significant risk to organizations across multiple sectors. CISA has issued an advisory highlighting the critical nature of this vulnerability and recommending immediate patching and mitigation measures.
On March 31, 2026, security researchers disclosed a critical vulnerability (CVE-2026-3055) affecting Citrix NetScaler ADC (formerly NetScaler ADC) and Gateway appliances. The vulnerability stems from an out-of-bounds read condition that could allow attackers to access sensitive information beyond intended boundaries and potentially lead to system compromise.
The vulnerability exists in the core functionality of NetScaler systems and affects both ADC and Gateway implementations. Key technical details include:
The vulnerability poses significant risks to:
Organizations in the following sectors are particularly at risk:
Security teams should implement the following measures immediately:
Monitor for the following potential indicators:
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