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# Critical NetScaler Flaws Prompt Urgent Update Advice From CERT-EU
- URL: https://cyfrz.com/critical-netscaler-flaws-prompt-urgent-update-advice-from-cert-eu/
- Published: 2026-11-12T21:48:40.000Z
- Updated: 2026-11-12T21:48:40.000Z
- Description: CERT-EU urges NetScaler updates after critical memory flaws, including one affecting default deployments. No exploitation was reported in its November 12 advisory.
- Author: 9ino
- Tags: News, Vulnerabilities

Cloud Software Group released security bulletins on November 12 addressing 28 memory flaws in NetScaler ADC and NetScaler Gateway, according to CERT-EU. One issue, CVE-2026-120868, affects all deployments, including systems using default settings.

That flaw sits in the software that processes network traffic and does not require an attacker to log in. CERT-EU rates it 9.3 out of 10\. Another issue, CVE-2026-107412, is rated 9.5 and affects appliances configured as a gateway or authentication server.

The vendor describes the impact as unexpected behavior or denial of service—disruption that can make a system unavailable. CERT-EU’s November 12 advisory says Citrix reported no exploitation and that no public proof-of-concept had been confirmed. These are critical patching priorities, not evidence of a confirmed breach.

For organizations running these appliances, CERT-EU recommends upgrading to fixed releases, starting with internet-facing gateways and authentication systems. NetScaler’s own remediation guidance also calls for upgrading affected instances to a release and build containing the fix.

Sources: [CERT-EU security advisory, November 12](https://cert.europa.eu/publications/security-advisories/2026-020/pdf?ref=cyfrz.com) · [NetScaler remediation guidance](https://docs.netscaler.com/us/en/netscaler-console-service/security-advisory-dashboard/remediate-vulnerabilities-cve-2026-120868.html?ref=cyfrz.com).