CVE-2026-20127
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Basic Information
- CVE State
- PUBLISHED
- Reserved Date
- October 08, 2025
- Published Date
- February 25, 2026
- Last Updated
- February 26, 2026
- Vendor
- Cisco
- Product
- Cisco Catalyst SD-WAN Manager
- Description
- A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
- Tags
- Exploitation
- active
- Automatable
- Yes
- Technical Impact
- total
- Exploited in the Wild
- Yes (2026-06-01 11:10:29 UTC) Source
cisa
CVSS Scores
CVSS v3.1
10.0 - CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC Information
Exploit Status
Known Exploited Vulnerability Information
| Source | Added Date |
|---|---|
| CVE | 2026-06-01 11:10:29 UTC |
Timeline
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CVE ID Reserved
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CVE Published to Public
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Added to KEVIntel