Citrix NetScaler ADC und Gateway: Schwachstelle ermöglicht Codeausführung und DoS
WID-SEC-2026-3847 · first 09.10.2026 · updated 09.10.2026 · CVSS 9,0
What it is about
Citrix NetScaler ist eine integrierte Lösung für die Beschleunigung, das Traffic Management und die Sicherheit von Web-Applikationen. Citrix Access Gateway ist ein universell einsetzbares SSL-VPN. Advanced Access Control (AAC) ermöglichen es Administratoren, Zugriffsregeln für das Access Gateway festzulegen. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Citrix Systems NetScaler ausnutzen, um beliebigen Programmcode auszuführen und um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Citrix Systems NetScaler ADC <14.1-73.46
- Citrix Systems NetScaler ADC <13.1-64.29
- Citrix Systems NetScaler ADC 14.1-FIPS <14.1-73.46
- Citrix Systems NetScaler ADC 13.1-FIPS <13.1.37.283
- Citrix Systems NetScaler Gateway <14.1-73.46
- Citrix Systems NetScaler Gateway <13.1-64.29
- Citrix Systems NetScaler ADC 13.1-NDcPP <13.1.37.283
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Citrix Systems NetScaler ADC 14.1-73.46
- Citrix Systems NetScaler ADC 13.1-64.29
- Citrix Systems NetScaler ADC 14.1-FIPS 14.1-73.46
- Citrix Systems NetScaler ADC 13.1-FIPS 13.1.37.283
- Citrix Systems NetScaler Gateway 14.1-73.46
- Citrix Systems NetScaler Gateway 13.1-64.29
- Citrix Systems NetScaler ADC 13.1-NDcPP 13.1.37.283
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- EU Vulnerability Database vom 2026-10-08 euvd.enisa.europa.eu
- Citrix Security Bulletin vom 2026-10-08 support.citrix.com
CVE: CVE-2026-107406
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.