Cisco Application Policy Infrastructure Controller: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-0519 · first 26.02.2026 · updated 26.02.2026 · CVSS 5,5
What it is about
Der Cisco Application Policy Infrastructure Controller (APIC) ist die architektonische Hauptkomponente der Cisco Application Centric Infrastructure. Ein lokaler Angreifer kann eine Schwachstelle in Cisco Application Policy Infrastructure Controller ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Only with access to the device or an account on it. Often the second step after a phishing email.
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 Application Policy Infrastructure Controller <6.1(4h)
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Cisco Application Policy Infrastructure Controller 6.1(4h)
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-apic-dos-rNus8EFw vom 2026-02-25 sec.cloudapps.cisco.com
CVE: CVE-2026-20107
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.