Threat landscape
high

Cisco Expressway: Mehrere Schwachstellen

WID-SEC-2026-4105 · first 22.10.2026 · updated 22.10.2026 · CVSS 9,8

×

What it is about

Cisco Expressway ermöglicht die Nutzung verschiedener Intranetdienste aus dem Internet, ohne ein VPN zu benötigen. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Cisco Expressway ausnutzen, um beliebigen Code auszuführen – sogar mit Root-Rechten –, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

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 Code auszuführen – sogar mit Root-Rechten –
  • Sicherheitsmaßnahmen zu umgehen
  • vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen

Am I affected?

Affected according to the BSI:

  • Cisco Expressway <X15.5.3
  • Cisco Expressway X14
  • Cisco Expressway <X15.5.20

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Cisco Expressway X15.5.3
  • Cisco Expressway X15.5.20

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

CVE: CVE-2026-76490, CVE-2026-76491, CVE-2026-76492, CVE-2026-76493, CVE-2026-76494, CVE-2026-76495, CVE-2026-76496, CVE-2026-76497, CVE-2026-76435, CVE-2026-76466

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.

Set up in an hour, trained in a week.

Create a free account, add your team, unlock the course. You only pay when you start. Would you rather see what a test email looks like first? The self-test is free.

Add your team Test it yourself first