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Citrix released security updates to address multiple vulnerabilities affecting Citrix XenServer, NetScaler ADC, and NetScaler Gateway, warning that the flaws could lead to denial-of-service conditions, memory corruption, disclosure of sensitive information, arbitrary code execution, and unauthorized access. The update was highlighted by EG-FinCIRT, which said organizations should apply the fixes after completing testing.
The most prominent issues are CVE-2026-8451 and CVE-2026-8452, both affecting NetScaler ADC and NetScaler Gateway and each assigned a CVSS 4.0 score of 8.8. EG-FinCIRT described CVE-2026-8451 as an insufficient input validation flaw and CVE-2026-8452 as a race condition vulnerability, underscoring the risk to internet-facing Citrix infrastructure commonly used for application delivery and remote access.
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1 event from the most recent confirmed update back to the earliest known activity.
On July 1, 2026, Citrix released security updates to address multiple vulnerabilities affecting Citrix XenServer, Citrix NetScaler ADC, and Citrix NetScaler Gateway. The flaws could allow denial-of-service, memory corruption, sensitive information disclosure, arbitrary code execution, and unauthorized access, including CVE-2026-8451 and CVE-2026-8452.
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Citrix published a security advisory for **NetScaler ADC** and **NetScaler Gateway**, warning that multiple high-severity vulnerabilities can be exploited remotely in specific deployments and configurations. The advisory, highlighted by the Canadian Centre for Cyber Security, affects the `14.1` and `13.1` release lines as well as certain **NetScaler FIPS** and **NDcPP** editions, and references six CVEs including `CVE-2026-8451`, `CVE-2026-8452`, `CVE-2026-8655`, and `CVE-2026-13474`. Administrators were urged to review Citrix’s bulletin and move affected systems to fixed versions. The disclosed flaws include a malformed HTTP/2 request issue that can trigger denial of service when HTTP/2 is enabled on affected LB, CS, VPN virtual servers or services (`CVE-2026-13474`); multiple memory overflow vulnerabilities tied to Oracle load balancer, DNS proxy, and DNS recursive resolver deployments (`CVE-2026-8655`); a memory overread caused by insufficient input validation when NetScaler is configured as a **SAML Identity Provider** (`CVE-2026-8451`); and a separate memory overflow vulnerability affecting **Gateway** or **AAA** virtual servers, including **SSL VPN**, **ICA Proxy**, **CVPN**, and **RDP Proxy** deployments (`CVE-2026-8452`). Recommended mitigations include applying Citrix security updates, disabling HTTP/2 or vulnerable Gateway features where not required, reviewing exposed virtual server and HTTP profile configurations, and monitoring for anomalous behavior.
Jul 1, 2026
Citrix disclosed critical vulnerabilities affecting **NetScaler ADC** and **NetScaler Gateway**, prompting alerts from both the Canadian Centre for Cyber Security and CERT-EU. The issues are tracked as `CVE-2026-3055` and `CVE-2026-4368`, and impact multiple supported release branches, including **14.1**, **13.1**, and **13.1 FIPS/NDcPP** versions running below the vendor’s fixed builds. Affected deployments include standard **NetScaler ADC**, **NetScaler Gateway**, and hardened **FIPS/NDcPP** editions. Government cyber authorities urged organizations to review Citrix’s security bulletin and apply the recommended updates and mitigations without delay. The coordinated advisories indicate broad concern across enterprise and public-sector environments that rely on Citrix application delivery and remote access infrastructure, with administrators advised to identify exposed appliances and move vulnerable systems to patched versions listed by Citrix.
Jul 1, 2026
Citrix published a security bulletin for **NetScaler ADC** and **NetScaler Gateway** covering two vulnerabilities tracked as `CVE-2026-3055` and `CVE-2026-4368`. The advisory identifies the affected product line and directs customers to vendor guidance for remediation, signaling that organizations using these edge-access and application delivery platforms should review exposure and apply Citrix-recommended updates or mitigations. Because **NetScaler ADC** and **NetScaler Gateway** are commonly deployed at the network perimeter for remote access, traffic management, and application delivery, the bulletin is relevant to internet-facing infrastructure and remote connectivity services. Security teams should inventory affected appliances, validate version status against the Citrix advisory, and prioritize patching or compensating controls to reduce the risk associated with the two listed CVEs.
Jun 29, 2026