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, 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 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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since today.

No EPSS score available.

Exploitation active

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Catalyst SD-WAN Manager unknown
Version Status Constraints
20.1.12 affected —
19.2.1 affected —
18.4.4 affected —
18.4.5 affected —
20.1.1.1 affected —
20.1.1 affected —
19.2.099 affected —
18.3.6 affected —
18.3.7 affected —
19.2.0 affected —
19.1.0 affected —
18.4.303 affected —
19.2.098 affected —
18.3.6.1 affected —
18.2.0 affected —
17.2.8 affected —
18.3.3.1 affected —
18.4.0 affected —
18.3.1 affected —
17.2.6 affected —
17.2.9 affected —
17.2.5 affected —
18.4.0.1 affected —
18.3.3 affected —
18.3.0 affected —
19.2.3 affected —
18.4.501_ES affected —
20.1.2 affected —
19.2.929 affected —
19.2.31 affected —
20.3.2 affected —
19.2.4 affected —
19.2.4.0.9 affected —
20.1.3.1 affected —

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk cve-icon cve-icon
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 cve-icon cve-icon
History

Thu, 14 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 14 May 2026 18:30:00 +0000

Type Values Removed Values Added
References

Thu, 14 May 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-05-14T00:00:00+00:00', 'dueDate': '2026-05-17T00:00:00+00:00'}

Thu, 14 May 2026 17:00:00 +0000

Type Values Removed Values Added
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, 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 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.
Title Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Weaknesses CWE-287
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-05-14T17:41:31.264Z

Reserved: 2025-10-08T11:59:15.393Z

Link: CVE-2026-20182

cve-icon Vulnrichment

Updated: 2026-05-14T17:41:18.017Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-14T17:16:19.387

Modified: 2026-05-14T18:16:35.260

Link: CVE-2026-20182

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T18:30:26Z

Weaknesses