CVE-2026-8452

CISA 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.

CISA Adds Six Actively Exploited Vulnerabilities to KEV Catalog Including Citrix NetScaler, Linux Kernel and Microsoft SQL Server Flaws

On August 26, 2026, CISA added six vulnerabilities to its Known Exploited Vulnerabilities catalog, signaling confirmed active exploitation and requiring immediate remediation priority. The batch includes a recent memory corruption issue in Citrix NetScaler ADC and NetScaler Gateway tracked as CVE-2026-8452, along with five older flaws affecting Microsoft SQL Server, the Linux kernel, Ajax.NET Professional, Red Hat libuser, and Red Hat ABRT. Citrix released patches for the NetScaler vulnerability on June 30, 2026, while CISA set an August 29, 2026 deadline for federal agencies. Real-world attacks have already deployed web shells and performed reconnaissance after successful exploitation of the Citrix appliance. The remaining CVEs enable remote code execution, local privilege escalation, and denial-of-service conditions across widely deployed enterprise technologies.

CISA Adds Six Known Exploited Vulnerabilities Affecting NetScaler ADC, Linux Kernel and Microsoft SQL Server to KEV Catalog

The U.S. Cybersecurity and Infrastructure Security Agency has added six vulnerabilities to its Known Exploited Vulnerabilities catalog after confirming active exploitation in the wild. One of the flaws, CVE-2026-8452, affects Citrix NetScaler ADC and NetScaler Gateway products and can trigger denial-of-service conditions under specific configurations. The remaining five issues, disclosed between 2015 and 2022, impact the Linux Kernel, Red Hat Automatic Bug Reporting Tool, and the libuser library. Exploitation of these older flaws can allow local attackers to escalate privileges or corrupt password files. Organizations are urged to apply available patches and verify configurations immediately.