NVD

CVE-2026-20182 Detail

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: Cisco Systems, Inc.

Base Score: 10.0 CRITICAL

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk	Cisco Systems, Inc.	Not Applicable
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW	Cisco Systems, Inc.	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182	CISA-ADP	US Government Resource

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name	Date Added	Due Date	Required Action
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability	05/14/2026	05/17/2026	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.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	Cisco Systems, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Initial Analysis by NIST 5/15/2026 8:45:53 AM

Action	Type	New Value
Added	CPE Configuration	OR cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions up to (excluding) 20.9.9.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 20.12.6 up to (excluding) 20.12.6.2 cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 20.13 up to (excluding) 20.15.4.4 cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 20.15.5 up to (excluding) 20.15.5.2 cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 20.16 up to (excluding) 20.18.2.2 cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 26.1 up to (excluding) 26.1.1.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.7::::::: cpe:2.3:a:cisco:catalyst_sd-wan_manager::::::::* versions from (including) 20.10 up to (excluding) 20.12.5.4 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions up to (excluding) 20.9.9.1 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 20.10 up to (excluding) 20.12.5.4 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 20.12.6 up to (excluding) 20.12.6.2 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 20.13 up to (excluding) 20.15.4.4 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 20.15.5 up to (excluding) 20.15.5.2 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 20.16 up to (excluding) 20.18.2.2 cpe:2.3:a:cisco:sd-wan_vsmart_controller::::::::* versions from (including) 26.1 up to (excluding) 26.1.1.1 cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.7:::::::
Added	Reference Type	CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182 Types: US Government Resource
Added	Reference Type	Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk Types: Not Applicable
Added	Reference Type	Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW Types: Vendor Advisory

New CVE Received from Cisco Systems, Inc. 5/14/2026 1:16:19 PM

Action	Type	New Value
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.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Added	CWE	CWE-287
Added	Reference	https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk
Added	Reference	https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW

Quick Info

CVE Dictionary Entry:
CVE-2026-20182
NVD Published Date:
05/14/2026
NVD Last Modified:
05/15/2026
Source:
Cisco Systems, Inc.

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