Threat landscape
high

Cisco IOS XR: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

WID-SEC-2026-3155 · first 03.09.2026 · updated 03.09.2026 · CVSS 9,8

×

What it is about

Cisco Internetwork Operating System (IOS) ist ein Betriebssystem, das für Cisco Geräte wie z. B. Router und Switches eingesetzt wird. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Cisco IOS XR ausnutzen, um einen nicht näher spezifizierten 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

  • einen nicht näher spezifizierten Angriff durchzuführen

Am I affected?

Affected according to the BSI:

  • Cisco IOS XR

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

What helps?

Install the updates provided by the vendor; details in the sources below.

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-2026-20274, CVE-2026-20275, CVE-2026-20276, CVE-2026-20277, CVE-2026-20278, CVE-2026-20279, CVE-2026-20280

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