CVE-2025-7775 is a critical memory overflow vulnerability that allows for remote code execution and/or denial of service in Citrix NetScaler ADC and NetScaler Gateway. This vulnerability can be exploited when NetScaler is configured as a Gateway (e.g., VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or as an AAA virtual server. Organizations using versions 13.1, 14.1, 13.1-FIPS, and NDcPP are particularly at risk when using load balancing virtual servers of type (HTTP, SSL, or HTTP_QUIC) bound with IPv6 services.
The CVSS score for this vulnerability is 9.2, indicating a critical severity level. The risk to organizations includes the potential for attackers to execute arbitrary code remotely, leading to severe operational disruptions. Given the exploitability of this vulnerability, organizations should prioritize patching immediately.
The vulnerability was published on August 26, 2025, and has already been added to the Known Exploited Vulnerabilities (KEV) catalog. This emphasizes the urgency for organizations to address this vulnerability swiftly and effectively.
With the potential for high-impact consequences, including unauthorized access and denial of service, it is critical for organizations to recognize the severity of this vulnerability and implement necessary mitigations immediately.
Vulnerability Details
CVE-2025-7775 is classified as a memory overflow vulnerability that leads to remote code execution and/or denial of service. The vulnerability affects Citrix products specifically the NetScaler ADC and NetScaler Gateway. The official description highlights the risk associated with various server configurations. The CVSS score of 9.2 reflects the critical nature of this vulnerability, where confidentiality, integrity, and availability impacts are all high.
The affected product, Citrix NetScaler, includes several versions, emphasizing the broad impact across different deployments. The CWE classification for this vulnerability is CWE-119, which indicates improper restrictions on buffer operations, highlighting the technical flaw that leads to this vulnerability.
Technical Analysis
The root cause of CVE-2025-7775 lies in memory overflow, which occurs when the application improperly handles input data without appropriate boundary checks. This vulnerability is exploitable through a network attack vector, with high attack complexity, meaning that successful exploitation may require specific conditions or configurations.
No privileges are required for exploitation, and user interaction is not necessary. The potential impacts include high confidentiality, integrity, and availability impact, as the exploitation could lead to complete control of the affected systems.
Risk & Impact Analysis
The risk to organizations includes severe operational disruptions, unauthorized access, and potential data breaches. The blast radius for this vulnerability is substantial, as it affects multiple deployment types within Citrix environments. Given the critical nature of the vulnerability and its classification in the KEV catalog, it is vital for organizations to prioritize patching and remediation efforts.
Organizations that fail to address this vulnerability may find themselves at significant risk of exploitation, leading to potential data loss and service interruption. The urgency for remediation is underscored by the critical CVSS score and the active exploitation status.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions include Citrix NetScaler ADC and NetScaler Gateway versions 13.1, 14.1, 13.1-FIPS, and NDcPP. Organizations should note that all versions prior to the vendor patch are at risk.
Mitigation & Remediation
To mitigate the risks associated with this vulnerability, organizations should apply the latest patches provided by Citrix. For detailed guidance, refer to the vendor's advisory. Organizations unable to patch immediately should consider implementing network controls to limit exposure while prioritizing the patching process.
Additionally, organizations can enhance their security posture by engaging in penetration testing to assess their defenses against potential exploitation of vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, including unusual traffic patterns targeting NetScaler configurations. Behavioral anomalies, such as unexpected crashes or performance degradation, may also signal exploitation.
AppSecure Threat Intelligence Insight
CVE-2025-7775 represents a critical vulnerability that aligns with ongoing trends in cyber threats, particularly targeting network infrastructure. Security teams should take this incident as a lesson to reinforce their defenses against memory overflow vulnerabilities and ensure comprehensive testing during application development.
For further insights into threat modeling and vulnerability assessments, organizations can refer to various resources, including vulnerability management programs, penetration testing methodologies, and API security testing to establish a robust security framework.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)