Cisco Catalyst SD-WAN Manager und SD-WAN Controller: Mehrere Schwachstellen
WID-SEC-2026-0516 · first 26.02.2026 · updated 21.04.2026 · CVSS 10,0
What it is about
Cisco Catalyst SD-WAN ist eine Netzwerklösung, die Software-definierte Wide-Area-Networking-Funktionen (SD-WAN) mit Cisco Catalyst Series Switches kombiniert, um die Netzwerkleistung an verteilten Standorten zu optimieren und zu sichern. Ein entfernter, anonymer oder lokaler Angreifer kann mehrere Schwachstellen in Cisco Catalyst SD-WAN Manager ausnutzen, um Administratorrechte zu erlangen, die Authentifizierung zu umgehen, Befehle mit Netadmin-Rechten auszuführen, sensible Systeminformationen zu lesen und beliebige Dateien auf dem System zu überschreiben.
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
- Administratorrechte zu erlangen
- die Authentifizierung zu umgehen
- Befehle mit Netadmin-Rechten auszuführen
- sensible Systeminformationen zu lesen
- beliebige Dateien auf dem System zu überschreiben
Am I affected?
Affected according to the BSI:
- Cisco Catalyst SD-WAN Manager <20.9.8.2
- Cisco Catalyst SD-WAN Manager <20.12.6.1
- Cisco Catalyst SD-WAN Manager <20.12.5.3
- Cisco Catalyst SD-WAN Manager <20.15.4.2
- Cisco Catalyst SD-WAN Manager <20.18.2.1
- Cisco Catalyst SD-WAN Manager SD-WAN Controller <20.9.8.2
- Cisco Catalyst SD-WAN Manager SD-WAN Controller <20.12.5.3
- Cisco Catalyst SD-WAN Manager SD-WAN Controller <20.12.6.1
- Cisco Catalyst SD-WAN Manager SD-WAN Controller <20.15.4.2
- Cisco Catalyst SD-WAN Manager SD-WAN Controller <20.18.2.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Cisco Catalyst SD-WAN Manager 20.9.8.2
- Cisco Catalyst SD-WAN Manager 20.12.6.1
- Cisco Catalyst SD-WAN Manager 20.12.5.3
- Cisco Catalyst SD-WAN Manager 20.15.4.2
- Cisco Catalyst SD-WAN Manager 20.18.2.1
- Cisco Catalyst SD-WAN Manager SD-WAN Controller 20.9.8.2
- Cisco Catalyst SD-WAN Manager SD-WAN Controller 20.12.5.3
- Cisco Catalyst SD-WAN Manager SD-WAN Controller 20.12.6.1
- Cisco Catalyst SD-WAN Manager SD-WAN Controller 20.15.4.2
- Cisco Catalyst SD-WAN Manager SD-WAN Controller 20.18.2.1
Is the vulnerability already being exploited?
- CVE-2026-20122: exploited in the wild according to CISA, in the catalogue since 20.04.2026.
- CVE-2026-20133: exploited in the wild according to CISA, in the catalogue since 20.04.2026.
- CVE-2026-20128: exploited in the wild according to CISA, in the catalogue since 20.04.2026.
- CVE-2026-20127: exploited in the wild according to CISA, in the catalogue since 25.02.2026.
Information and sources
- Original BSI advisory (WID)
- Cisco Security Advisory cisco-sa-sdwan-authbp-qwCX8D4v vom 2026-02-25 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-sdwan-rpa-EHchtZk vom 2026-02-25 sec.cloudapps.cisco.com
- CISA KEV: CVE-2026-20127 Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability vom 2026-02-25 www.cisa.gov
- Cisco Talos Blog: Active exploitation of Cisco Catalyst SD-WAN by UAT-8616 vom 2026-02-25 blog.talosintelligence.com
- Australian Signals Directorate - Cisco SD-WAN Threat Hunt Guide www.cyber.gov.au
- PoC CVE-2026-20127 github.com
CVE: CVE-2026-20122, CVE-2026-20126, CVE-2026-20128, CVE-2026-20129, CVE-2026-20133, CVE-2026-20127
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.