Explore the latest Citrix security updates, vulnerabilities, and best practices. Stay informed on protecting your Citrix environment with our insights.
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Background for this topic.
Citrix delivers virtualization and remote access platforms that enable users to run applications and desktops hosted on centralized servers. These technologies support remote work by providing virtualized environments accessible from various devices, often serving as gateways to internal corporate networks. Key components include virtual apps, desktops, and networking tools that facilitate secure connections to enterprise resources.
Citrix environments are critical security targets because vulnerabilities can allow attackers to bypass authentication, execute remote code, or escalate privileges, potentially leading to broader network compromise. Security risks increase with misconfigurations or delayed patching of known flaws. Defenders should prioritize timely updates, enforce strong multi-factor authentication, and monitor remote sessions for unusual activity to reduce exposure to exploitation attempts targeting Citrix infrastructure.
Weekly headline count for the current query.
Hackers are exploiting a critical severity vulnerability, tracked as CVE-2026-3055, in Citrix NetScaler ADC and NetScaler Gateway appliances to obtain sensitive data. [...]
An advanced threat actor exploited the critical vulnerabilities "Citrix Bleed 2" (CVE-2025-5777) in NetScaler ADC and Gateway, and CVE-2025-20337 affecting Cisco Identity Service Engine (ISE) as zero-days to deploy custom malware. [...]
More than 28,200 Citrix instances are vulnerable to a critical remote code execution vulnerability tracked as CVE-2025-7775 that is already being exploited in the wild. [...]
Citrix fixed three NetScaler ADC and NetScaler Gateway flaws today, including a critical remote code execution flaw tracked as CVE-2025-7775 that was actively exploited in attacks as a zero-day vulnerability. [...]
The Netherlands' National Cyber Security Centre (NCSC) is warning that a critical Citrix NetScaler vulnerability tracked as CVE-2025-6543 was exploited to breach "critical organizations" in the country. [...]
A critical Citrix NetScaler vulnerability, tracked as CVE-2025-5777 and dubbed "CitrixBleed 2," was actively exploited nearly two weeks before proof-of-concept (PoC) exploits were made public, despite Citrix stating that there was no evidence of attacks. [...]
The U.S. Cybersecurity & Infrastructure Security Agency has confirmed active exploitation of the CitrixBleed 2 vulnerability (CVE-2025-5777) in Citrix NetScaler ADC and Gateway and is giving federal agencies one day to apply fixes. [...]
Researchers have released proof-of-concept (PoC) exploits for a critical Citrix NetScaler vulnerability, tracked as CVE-2025-5777 and dubbed CitrixBleed2, warning that the flaw is easily exploitable and can successfully steal user session tokens. [...]
A critical NetScaler ADC and Gateway vulnerability dubbed "Citrix Bleed 2" (CVE-2025-5777) is now likely exploited in attacks, according to cybersecurity firm ReliaQuest, seeing an increase in suspicious sessions on Citrix devices. [...]
A critical NetScaler ADC and Gateway vulnerability dubbed "Citrix Bleed 2" (CVE-2025-5777) is now likely exploited in attacks, according to cybersecurity firm ReliaQuest, seeing an increase in suspicious sessions on Citrix devices. [...]
Citrix is warning that a vulnerability in NetScaler appliances tracked as CVE-2025-6543 is being actively exploited in the wild, causing devices to enter a denial of service condition. [...]
Citrix reminded admins today that they must take additional measures after patching their NetScaler appliances against the CVE-2023-4966 'Citrix Bleed' vulnerability to secure vulnerable devices against attacks. [...]
The Lockbit ransomware attacks use publicly available exploits for the Citrix Bleed vulnerability (CVE-2023-4966) to breach the systems of large organizations, steal data, and encrypt files. [...]
Threat actors are leveraging the 'Citrix Bleed' vulnerability, tracked as CVE-2023-4966, to target government, technical, and legal organizations in the Americas, Europe, Africa, and the Asia-Pacific region. [...]
A proof-of-concept (PoC) exploit is released for the 'Citrix Bleed' vulnerability, tracked as CVE-2023-4966, that allows attackers to retrieve authentication session cookies from vulnerable Citrix NetScaler ADC and NetScaler Gateway appliances. [...]
Citrix warned admins today to secure all NetScaler ADC and Gateway appliances immediately against ongoing attacks exploiting the CVE-2023-4966 vulnerability. [...]
A critical vulnerability tracked as CVE-2023-4966 in Citrix NetScaler ADC/Gateway devices has been actively exploited as a zero-day since late August, security researchers announced. [...]
Hackers are conducting a large-scale campaign to exploit the recent CVE-2023-3519 flaw in Citrix NetScaler Gateways to steal user credentials. [...]