CVE-2026-20182

KEV
Published: Mag 14, 2026 Last Modified: Mag 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
CRITICAL 10,0
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: high

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,3170
Percentile
1,0th
Updated

EPSS Score Trend (Last 6 Days)

287

Improper Authentication

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Confidentiality Availability Access Control
Potential Impacts:
Read Application Data Gain Privileges Or Assume Identity Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies: Not Technology-Specific, Web Based, ICS/OT
Likelihood of Exploit: High
View CWE Details
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
To 20.9.9.1 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version 20.12.7
cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.7:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 20.10 (inclusive)
To 20.12.5.4 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 20.13 (inclusive)
To 20.15.4.4 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 20.16 (inclusive)
To 20.18.2.2 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
To 20.9.9.1 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version 20.12.7
cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.7:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 20.15.5 (inclusive)
To 20.15.5.2 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 26.1 (inclusive)
To 26.1.1.1 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 20.10 (inclusive)
To 20.12.5.4 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 20.15.5 (inclusive)
To 20.15.5.2 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 20.16 (inclusive)
To 20.18.2.2 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 26.1 (inclusive)
To 26.1.1.1 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 20.12.6 (inclusive)
To 20.12.6.2 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Sd-Wan Vsmart Controller by Cisco

Product Information
Vendor Cisco
Product Sd-Wan Vsmart Controller
Version Range Affected
From 20.13 (inclusive)
To 20.15.4.4 (exclusive)
cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Catalyst Sd-Wan Manager by Cisco

Product Information
Vendor Cisco
Product Catalyst Sd-Wan Manager
Version Range Affected
From 20.12.6 (inclusive)
To 20.12.6.2 (exclusive)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://www.cisa.gov/known-exploited-vulnerabilities-catalo…
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026…
https://sec.cloudapps.cisco.com/security/center/content/Cis…
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/c…
https://sec.cloudapps.cisco.com/security/center/content/Cis…
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/c…