Topic
NetScaler Gateway
Hackers Exploit Two Critical Citrix NetScaler Zero-Days to Deploy Web Shells and Enable Lateral Movement
Vulnerabilities & Exploits
CISA Sets September 30 Deadline for Federal Agencies to Patch Actively Exploited Citrix NetScaler Zero-Days
Vulnerabilities & Exploits
Multiple Critical Vulnerabilities Found in Citrix NetScaler ADC and Gateway, Two Actively Exploited
Vulnerabilities & ExploitsCISA Adds CVE-2026-8452 to KEV Catalog and Orders Federal Agencies to Patch Citrix NetScaler by August 29 2026
CISA has placed CVE-2026-8452 in its Known Exploited Vulnerabilities catalog, compelling US federal agencies to apply patches to Citrix NetScaler before the unusually tight deadline of August 29 2026. The flaw, initially reported as a memory overflow leading to denial of service, has been confirmed through public technical analysis to enable unauthenticated remote code execution with root privileges on unpatched devices. The vulnerability impacts NetScaler ADC and NetScaler Gateway appliances configured as VPN Gateway or AAA virtual servers, with heightened risk in SAML-based deployments acting as either Service Provider or Identity Provider. Attackers have already conducted spray-and-pray campaigns that deploy webshells and perform basic reconnaissance after initial compromise. Tens of thousands of NetScaler instances remain internet-exposed, increasing the likelihood of automated mass exploitation. Citrix has released fixed builds including 14.1-72.61, 13.1-63.18, and 13.1-37.272 or higher for FIPS and NDcPP environments. Organizations are advised to inventory exposed devices, verify versions, hunt for indicators of compromise, and apply additional hardening measures beyond patching.
CISA Orders Federal Agencies to Patch Critical Citrix NetScaler RCE Flaw by August 29 2026
CISA has added CVE-2026-8452 to its Known Exploited Vulnerabilities catalog and set an unusually tight deadline for U.S. federal agencies to remediate the issue in Citrix NetScaler products. The vulnerability, initially described as a denial-of-service condition, is now actively exploited to achieve unauthenticated remote code execution with root privileges on unpatched appliances. Affected configurations include NetScaler ADC and NetScaler Gateway when deployed as VPN Gateway or AAA virtual servers, especially in environments using SAML for single sign-on. Attackers have been observed deploying webshells and performing reconnaissance after initial compromise in a spray-and-pray pattern. Tens of thousands of NetScaler devices remain exposed to the internet, increasing the risk of widespread automated attacks. Citrix has released fixed builds including 14.1-72.61 and 13.1-63.18, along with specific versions for FIPS and NDcPP environments.
Critical Authentication Bypass and Buffer Overflow Flaws Patched in NetScaler ADC and Gateway
Cloud Software Group disclosed two critical vulnerabilities affecting NetScaler ADC and NetScaler Gateway products. CVE-2026-19490 permits authentication bypass via an alternate path when the appliances operate as SSL VPN, ICA proxy, CVPN, or RDP proxy gateways, or when configured as authentication, authorization, and auditing virtual servers. CVE-2026-19489 is a buffer overflow in LSN groups with SIP ALG enabled that can lead to unexpected behavior or denial of service. Both issues received CVSS v4.0 base scores of 9.3 and 8.8 respectively. Fixed builds 14.1-73.32 and 13.1-63.21 are now available along with corresponding FIPS and NDcPP updates.