Threat landscape
critical exploited

Citrix Systems NetScaler: Mehrere Schwachstellen

WID-SEC-2026-0836 · first 24.03.2026 · updated 30.03.2026 · CVSS 10,0

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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 oder authentisierter Angreifer kann mehrere Schwachstellen in Citrix Systems NetScaler ausnutzen, um Informationen offenzulegen und um eine Benutzersitzung zu übernehmen.

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

  • Informationen offenzulegen
  • eine Benutzersitzung zu übernehmen

Am I affected?

Affected according to the BSI:

  • Citrix Systems NetScaler ADC <14.1-66.59
  • Citrix Systems NetScaler Gateway <14.1-66.59
  • Citrix Systems NetScaler ADC <13.1-62.23
  • Citrix Systems NetScaler Gateway <13.1-62.23
  • Citrix Systems NetScaler ADC FIPS <13.1-37.262
  • Citrix Systems NetScaler ADC NDcPP <13.1-37.262

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 14.1-66.59
  • Citrix Systems NetScaler Gateway 14.1-66.59
  • Citrix Systems NetScaler ADC 13.1-62.23
  • Citrix Systems NetScaler Gateway 13.1-62.23
  • Citrix Systems NetScaler ADC FIPS 13.1-37.262
  • Citrix Systems NetScaler ADC NDcPP 13.1-37.262

Is the vulnerability already being exploited?

  • CVE-2026-3055: exploited in the wild according to CISA, in the catalogue since 30.03.2026.

Information and sources

CVE: CVE-2026-3055, CVE-2026-4368

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.

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