CVE-2026-20127 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2026-02-27.
Description
A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, 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.
Scoring
| CVSS | 10.0 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 88.48% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | yes — remediate by 2026-02-27 |
| Public exploit | none known |
| Published | 2026-02-25 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability |
|---|---|
| Added | 2026-02-25 |
| Due | 2026-02-27 |
| Vendor / product | Cisco / Catalyst SD-WAN Controller and Manager |
| Ransomware use | none reported |
Affected (3)
| Vendor | Product |
|---|---|
| cisco | catalyst sd-wan manager |
| cisco | sd-wan vbond orchestrator |
| cisco | sd-wan vsmart controller |
References
→ the Explorer · watch your stack · NVD