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CVE-2026-20127— Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco Catalyst SD-WAN Manager
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage）和Cisco Catalyst SD-WAN Controller都是美国思科（Cisco）公司的产品。Cisco Catalyst SD-WAN Manager是一个高度可定制的仪表板。可简化和自动化 Cisco SD-WAN 的部署、配置、管理和操作。Cisco Catalyst SD-WAN Controller是一个安全策略控制面板。 Cisco Catalyst SD-WAN Manager和C

CVSS 10.0 · Critical KEV EPSS 88.48% · P100

Public Exploits 1

Metasploit · 1 cisco_sdwan_auth_bypass.rb [auxiliary]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 335

VendorProduct Version RangeStatus
Cisco Cisco Catalyst SD-WAN Manager 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
19.3.0 affected
19.2.2 affected
… +327 more rows
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I. Basic Information for CVE-2026-20127

Vulnerability Information
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Vulnerability Title
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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 an 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. 
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Catalyst SD-WAN Manager和Cisco Catalyst SD-WAN Controller 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage）和Cisco Catalyst SD-WAN Controller都是美国思科（Cisco）公司的产品。Cisco Catalyst SD-WAN Manager是一个高度可定制的仪表板。可简化和自动化 Cisco SD-WAN 的部署、配置、管理和操作。Cisco Catalyst SD-WAN Controller是一个安全策略控制面板。 Cisco Catalyst SD-WAN Manager和C
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Catalyst SD-WAN Manager 20.1.12 -

II. Public POCs for CVE-2026-20127

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III. Intelligence Information for CVE-2026-20127

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Vendor Advisories for CVE-2026-20127 (1)

Same Patch Batch · Cisco · 2026-02-25 · 15 CVEs total

CVE-2026-20129 9.8 CRITICAL Cisco Catayst SD-WAN Authentication Bypass Vulnerability
CVE-2026-20126 8.8 HIGH Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability
CVE-2026-20048 7.7 HIGH Cisco NX-OS Software SNMP Denial of Service Vulnerability
CVE-2026-20128 7.5 HIGH Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability
CVE-2026-20033 7.4 HIGH Cisco NX-OS Software Denial of Service Vulnerability
CVE-2026-20010 7.4 HIGH Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service
CVE-2026-20051 7.4 HIGH Cisco Nexus 3600-R and 9500-R Series Switching Platforms Layer 2 Loop Denial of Service Vu
CVE-2026-20099 6.7 MEDIUM Cisco UCS Manager and FXOS Software Command Injection Vulnerability
CVE-2026-20036 6.5 MEDIUM Cisco UCS Manager Software Command Injection Vulnerability
CVE-2026-20133 6.5 MEDIUM Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 信息泄露漏洞
CVE-2026-20107 5.5 MEDIUM Cisco Application Policy Infrastructure Controller Denial of Service Vulnerability
CVE-2026-20122 5.4 MEDIUM Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
CVE-2026-20091 4.8 MEDIUM Cisco UCS Manager and FXOS Software Stored Cross-Site Scripting Vulnerability
CVE-2026-20037 4.4 MEDIUM Cisco UCS Manager File Write Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Catalyst SD-WAN Manager
Same vendor: Cisco
Same weakness: CWE-287

V. Comments for CVE-2026-20127

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