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CVE-2026-20182: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Critical · CVSS 10.0 (CVSS 3.1)KEV known exploitedEPSS 91.8%, 100th percentilePublished Updated Assigner: cisco

In CISA’s Known Exploited Vulnerabilities catalog: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

Required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Description

May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.  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 the 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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H · CWE-287

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Cisco: Cisco Catalyst SD-WAN ControllerCisco: Cisco Catalyst SD-WAN Manager

References

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