---
cve: "CVE-2026-20129"
severity: "CRITICAL"
cvss: 9.8
epss: "0.7%"
vendor: "Cisco"
kev: false
exploited: false
published: "2026-02-25 17:25:30"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-24T12:30:32+02:00"
---

# CVE-2026-20129

> 9.8 CRITICAL

## Beschreibung

A vulnerability in the API user authentication of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain access to an affected system as a user who has the netadmin role.

The vulnerability is due to improper authentication for requests that are sent to the API. An attacker could exploit this vulnerability by sending a crafted request to the API of an affected system. A successful exploit could allow the attacker to execute commands with the privileges of the netadmin role.
Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability. 

## CNA-Record (Kanon, cvelistV5)

- CNA: **cisco**
- State: PUBLISHED
- Stand: 2026-03-20 21:47:59
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## BSI-Hinweise (deutsch)

- [Cisco Catalyst SD-WAN Manager und SD-WAN Controller: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0516) — _BSI-Einstufung: kritisch_
  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.

## Referenzen

- <https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-20129/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_