CVE-2026-20182

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.

• CWE-287

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZkNot Applicable
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SWVendor Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182US Government Resource

Published

May 14, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-20174A vulnerability in the Metadata update feature of Cisco Nexu…4.9
• CVE-2026-20175A vulnerability in Cisco Finesse could allow an unauthentica…6.1
• CVE-2026-20178A vulnerability in the browser-based version of Cisco Webex …4.3
• CVE-2026-2018A flaw has been found in itsourcecode School Management Syst…9.8
• CVE-2026-20180A vulnerability in Cisco Identity Services Engine (ISE) coul…9.9
• CVE-2026-20181A vulnerability in Cisco ISE and ISE-PIC could allow an auth…9.1
• CVE-2026-20184A vulnerability in the integration of single sign-on (SSO) w…9.8
• CVE-2026-20185A vulnerability in the Simple Network Management Protocol (S…7.7
• CVE-2026-20186A vulnerability in Cisco Identity Services Engine (ISE) coul…9.9
• CVE-2026-20187As part of Cisco's ongoing commitment to proactive security …7.5
• CVE-2026-20188Following the initial publication of the Security Advisory a…0
• CVE-2026-20189A vulnerability in the log file download functionality of Ci…4.3