Cisco Nexus: Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2026-0523 · first 26.02.2026 · updated 26.02.2026 · CVSS 7,7
What it is about
Bei der Cisco Nexus Serie handelt es sich um modulare Switching-Systeme der Data Center-Klasse. Ein Angreifer kann mehrere Schwachstellen in Cisco Nexus ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Cisco Nexus 9000 Series Fabric Switches
- Cisco Nexus 3600 Series Switching Platform
- Cisco Nexus 9500-R Series Switching Platform
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
- Original BSI advisory (WID)
- Cisco Security Advisory cisco-sa-nxos-cpdos-qLsv6pFD vom 2026-02-25 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-nxos-dsnmp-cNN39Uh vom 2026-02-25 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-nxos-ether-dos-Kv8YNWZ4 vom 2026-02-25 sec.cloudapps.cisco.com
CVE: CVE-2026-20033, CVE-2026-20048, CVE-2026-20051
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.