CVE-2026-20182
Modified
Modified - Updated After Analysis
BaseFortify
Vulnerability report for CVE-2026-20182, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-05-14
Last updated on: 2026-06-16
Assigner: Cisco Systems, Inc.
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cisco | catalyst_sd-wan_manager | to 20.9.9.1 (exc) |
| cisco | catalyst_sd-wan_manager | From 20.10 (inc) to 20.12.5.4 (exc) |
| cisco | catalyst_sd-wan_manager | From 20.12.6 (inc) to 20.12.6.2 (exc) |
| cisco | catalyst_sd-wan_manager | From 20.13 (inc) to 20.15.4.4 (exc) |
| cisco | catalyst_sd-wan_manager | From 20.15.5 (inc) to 20.15.5.2 (exc) |
| cisco | catalyst_sd-wan_manager | From 20.16 (inc) to 20.18.2.2 (exc) |
| cisco | catalyst_sd-wan_manager | From 26.1 (inc) to 26.1.1.1 (exc) |
| cisco | catalyst_sd-wan_manager | 20.12.7 |
| cisco | sd-wan_vsmart_controller | to 20.9.9.1 (exc) |
| cisco | sd-wan_vsmart_controller | From 20.10 (inc) to 20.12.5.4 (exc) |
| cisco | sd-wan_vsmart_controller | From 20.12.6 (inc) to 20.12.6.2 (exc) |
| cisco | sd-wan_vsmart_controller | From 20.13 (inc) to 20.15.4.4 (exc) |
| cisco | sd-wan_vsmart_controller | From 20.15.5 (inc) to 20.15.5.2 (exc) |
| cisco | sd-wan_vsmart_controller | From 20.16 (inc) to 20.18.2.2 (exc) |
| cisco | sd-wan_vsmart_controller | From 26.1 (inc) to 26.1.1.1 (exc) |
| cisco | sd-wan_vsmart_controller | 20.12.7 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
