Cisco FXOS und Unified Computing System (UCS): Mehrere Schwachstellen
WID-SEC-2026-0522 · first 26.02.2026 · updated 26.02.2026 · CVSS 6,7
What it is about
FXOS (FirePOWER eXtensible Operating System) ist ein Betriebssystem für Cisco Firepower Appliances Bei dem Cisco Unified Computing System (UCS) handelt es sich um eine Rechenzentrumsplattform, die Rechenleistung, Netzwerk, Storage-Zugriff und Virtualisierung in einem System zusammenführt. Ein Angreifer kann mehrere Schwachstellen in Cisco FXOS und Cisco Unified Computing System (UCS) ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen, und um beliebigen Programmcode mit Administratorrechten auszuführen.
Under what conditions?
The BSI does not name any particular preconditions.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Cross-Site Scripting Angriff durchzuführen
- beliebigen Programmcode mit Administratorrechten auszuführen
Am I affected?
Affected according to the BSI:
- Cisco FXOS
- Cisco Unified Computing System (UCS) <4.3(6a)
- Cisco Unified Computing System (UCS) <4.3(6c)
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Cisco Unified Computing System (UCS) 4.3(6a)
- Cisco Unified Computing System (UCS) 4.3(6c)
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-ucsfxosxss-7skVE8Zv vom 2026-02-25 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-ucsciv-wGYtC78q vom 2026-02-25 sec.cloudapps.cisco.com
CVE: CVE-2026-20091, CVE-2026-20099
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.