On May 6, 2024, Bishop Fox publicly disclosed a vulnerability along with a proof of concept (PoC) exploit in Citrix NetScaler ADC and Gateway, identified as an unauthenticated out-of-bounds memory read issue in the components used for Authentication, Authorization, and Auditing (AAA).

On January 16, 2024, Citrix published a security bulletin disclosing two zero-day vulnerabilities (CVE-2023-6548 & CVE-2023-6549) being actively exploited in Citrix NetScaler ADC and NetScaler Gateway.

Two vulnerabilities have been detected in in Citrix NetScaler ADC and NetScaler Gateway. These vulnerabilities are being tracked as CVE-2023-6549 and CVE-2023-6548 with CVSS scores of 8.2 and 5.5 respectively. They are under active exploitation, affecting the following product versions.

On November 21st, the Cybersecurity and Infrastructure Security Agency (CISA), Federal Bureau of Investigation (FBI), Multi-State Information Sharing & Analysis Center (MS-ISAC), and Australian Signals Directorate’s Australian Cyber Security Center (ASD’s ACSC) released an advisory highlighting the ongoing exploit of the Citrix Bleed Vulnerability (CVE-2023-4966) by Lockbit 3.0 affiliates.

Critical zero-day Citrix CVE-2023-3519 is still being exploited two months after Citrix released a patch. IONIX research found that 19% of the CVE-2023-3519 vulnerabilities are still unmitigated in comparison to only 3% among IONIX customers. In addition, IONIX customers were able to resolve this critical risk three times faster.

On July 18th, 2023, Citrix disclosed a critical authentication bypass vulnerability affecting several versions of Citrix ADC and Citrix Gateway (CVE-2023-3519). The vulnerability was identified by independent security researchers, and was responsibly disclosed to Citrix. This vulnerability could allow a threat actor to execute arbitrary code on affected appliances and may also serve as an initial access vector for ransomware and other types of malicious campaigns.

On Tuesday, June 14, 2022, Citrix released patches for multiple vulnerabilities, including CVE-2022-27511, an unauthenticated remote privilege escalation vulnerability affecting Citrix Application Delivery Management (ADM). The vulnerability allows an unauthenticated user to remotely corrupt an affected system to reset the administrator password at the next device reboot. Successful exploitation allows a threat actor to gain initial access using the default credentials via SSH after a device reboot.

At the start of 2022, CrowdStrike Intelligence and CrowdStrike Services investigated an incident in which PROPHET SPIDER exploited CVE-2021-22941 — a remote code execution (RCE) vulnerability impacting Citrix ShareFile Storage Zones Controller — to compromise a Microsoft Internet Information Services (IIS) web server. The adversary exploited the vulnerability to deploy a webshell that enabled the downloading of additional tools.

CurrentWare’s suite of user activity monitoring, web filtering, device control, and remote PC power management software has been verified as Citrix Ready®. The Citrix Ready program helps users of Citrix Virtual Apps and Desktops (formerly Citrix XenApp and XenDesktop) identify third-party solutions that are verified as compatible with a Citrix VDI deployment.