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CVE Vulnerability Details :
CVE-2026-20127
PUBLISHED
More InfoOfficial Page
Assigner-cisco
Assigner Org ID-d1c1063e-7a18-46af-9102-31f8928bc633
View Known Exploited Vulnerability (KEV) details
Published At-25 Feb, 2026 | 16:14
Updated At-26 Feb, 2026 | 14:44
Rejected At-
▼CVE Numbering Authority (CNA)
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

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 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. 

Affected Products
Vendor
Cisco Systems, Inc.Cisco
Product
Cisco Catalyst SD-WAN Manager
Default Status
unknown
Versions
Affected
  • 20.1.12
  • 19.2.1
  • 18.4.4
  • 18.4.5
  • 20.1.1.1
  • 20.1.1
  • 19.3.0
  • 19.2.2
  • 19.2.099
  • 18.3.6
  • 18.3.7
  • 19.2.0
  • 18.3.8
  • 19.0.0
  • 19.1.0
  • 18.4.302
  • 18.4.303
  • 19.2.097
  • 19.2.098
  • 17.2.10
  • 18.3.6.1
  • 19.0.1a
  • 18.2.0
  • 18.4.3
  • 18.4.1
  • 17.2.8
  • 18.3.3.1
  • 18.4.0
  • 18.3.1
  • 17.2.6
  • 17.2.9
  • 18.3.4
  • 17.2.5
  • 18.3.1.1
  • 18.3.5
  • 18.4.0.1
  • 18.3.3
  • 17.2.7
  • 17.2.4
  • 18.3.0
  • 19.2.3
  • 18.4.501_ES
  • 20.3.1
  • 20.1.2
  • 19.2.929
  • 19.2.31
  • 20.3.2
  • 19.2.32
  • 20.3.2_925
  • 20.3.2.1
  • 20.3.2.1_927
  • 18.4.6
  • 20.1.2_937
  • 20.4.1
  • 20.3.2_928
  • 20.3.2_929
  • 20.4.1.0.1
  • 20.3.2.1_930
  • 19.2.4
  • 20.5.0.1.1
  • 20.4.1.1
  • 20.3.3
  • 19.2.4.0.1
  • 20.3.2_937
  • 20.3.3.1
  • 20.5.1
  • 20.1.3
  • 20.3.3.0.4
  • 20.3.3.1.2
  • 20.3.3.1.1
  • 20.4.1.2
  • 20.3.3.0.2
  • 20.4.1.1.5
  • 20.4.1.0.01
  • 20.4.1.0.02
  • 20.3.3.1.7
  • 20.3.3.1.5
  • 20.5.1.0.1
  • 20.3.3.1.10
  • 20.3.3.0.8
  • 20.4.2
  • 20.4.2.0.1
  • 20.3.4
  • 20.3.3.0.14
  • 19.2.4.0.8
  • 19.2.4.0.9
  • 20.3.4.0.1
  • 20.3.2.0.5
  • 20.6.1
  • 20.5.1.0.2
  • 20.3.3.0.17
  • 20.6.1.1
  • 20.6.0.18.3
  • 20.3.2.0.6
  • 20.6.0.18.4
  • 20.4.2.0.2
  • 20.3.3.0.16
  • 20.3.4.0.5
  • 20.6.1.0.1
  • 20.3.4.0.6
  • 20.6.2
  • 20.7.1EFT2
  • 20.3.4.0.9
  • 20.3.4.0.11
  • 20.4.2.0.4
  • 20.3.3.0.18
  • 20.7.1
  • 20.6.2.1
  • 20.3.4.1
  • 20.5.1.1
  • 20.4.2.1
  • 20.4.2.1.1
  • 20.3.4.1.1
  • 20.3.813
  • 20.3.4.0.19
  • 20.4.2.2.1
  • 20.5.1.2
  • 20.3.4.2
  • 20.3.814
  • 20.4.2.2
  • 20.6.2.2
  • 20.3.4.2.1
  • 20.7.1.1
  • 20.3.4.1.2
  • 20.6.2.2.2
  • 20.3.4.0.20
  • 20.6.2.2.3
  • 20.4.2.2.2
  • 20.3.5
  • 20.6.2.0.4
  • 20.4.2.2.3
  • 20.3.4.0.24
  • 20.6.2.2.7
  • 20.6.3
  • 20.3.4.2.2
  • 20.4.2.2.4
  • 20.7.1.0.2
  • 20.8.1
  • 20.3.5.0.8
  • 20.3.5.0.9
  • 20.4.2.2.8
  • 20.3.5.0.7
  • 20.6.3.0.7
  • 20.6.3.0.5
  • 20.6.3.0.10
  • 20.6.3.0.2
  • 20.7.2
  • 20.9.1EFT2
  • 20.6.3.0.11
  • 20.6.3.1
  • 20.6.3.0.14
  • 20.6.4
  • 20.9.1
  • 20.6.3.0.19
  • 20.6.3.0.18
  • 20.3.6
  • 20.9.1.1
  • 20.6.3.0.23
  • 20.6.4.0.4
  • 20.6.3.0.25
  • 20.6.5
  • 20.6.3.0.27
  • 20.9.2
  • 20.9.2.1
  • 20.6.3.0.29
  • 20.6.3.0.31
  • 20.6.3.0.32
  • 20.10.1
  • 20.6.3.0.33
  • 20.9.2.0.01
  • 20.9.1_LI_Images
  • 20.10.1_LI_Images
  • 20.9.2_LI_Images
  • 20.3.7
  • 20.9.3
  • 20.6.5.1
  • 20.11.1
  • 20.11.1_LI_Images
  • 20.9.3_LI_ Images
  • 20.6.3.1.1
  • 20.9.3.0.2
  • 20.6.5.1.2
  • 20.9.3.0.3
  • 20.4.2.3
  • 20.6.3.2
  • 20.6.4.1
  • 20.6.3.0.38
  • 20.6.3.0.39
  • 20.3.5.1
  • 20.3.4.3
  • 20.9.3.1
  • 20.3.3.2
  • 20.6.5.2
  • 20.3.7.1
  • 20.10.1.1
  • 20.6.5.2.1
  • 20.3.4.0.25
  • 20.6.2.2.4
  • 20.6.1.2
  • 20.11.1.1
  • 20.9.3.0.5
  • 20.3.4.0.26
  • 20.6.5.1.3
  • 20.6.3.0.40
  • 20.1.3.1
  • 20.9.2.2
  • 20.6.5.2.3
  • 20.6.5.1.4
  • 20.6.5.3
  • 20.6.3.0.41
  • 20.9.3.0.7
  • 20.6.5.1.5
  • 20.9.3.0.4
  • 20.6.4.0.19
  • 20.6.5.1.6
  • 20.9.3.0.8
  • 20.6.3.3
  • 20.3.7.2
  • 20.6.5.4
  • 20.6.5.1.7
  • 20.9.3.0.12
  • 20.6.4.2
  • 20.6.5.5
  • 20.9.3.2
  • 20.11.1.2
  • 20.6.3.4
  • 20.10.1.2
  • 20.6.5.1.9
  • 20.9.3.0.16
  • 20.6.3.0.45
  • 20.6.5.1.10
  • 20.9.3.0.17
  • 20.6.5.2.4
  • 20.6.4.0.21
  • 20.9.3.0.18
  • 20.6.3.0.46
  • 20.6.3.0.47
  • 20.9.2.3
  • 20.9.3.2_LI_Images
  • 20.9.3.0.21
  • 20.9.3.0.20
  • 20.9.4_LI_Images
  • 20.9.4
  • 20.6.5.1.11
  • 20.12.1
  • 20.12.1_LI_Images
  • 20.6.5.1.13
  • 20.9.3.0.23
  • 20.6.5.2.8
  • 20.9.4.1
  • 20.9.4.1_LI_Images
  • 20.9.3.0.25
  • 20.9.3.0.24
  • 20.6.5.1.14
  • 20.3.8
  • 20.6.6
  • 20.9.3.0.26
  • 20.6.3.0.51
  • 20.9.3.0.29
  • 20.12.2
  • 20.12.2_LI_Images
  • 20.6.6.0.1
  • 20.13.1_LI_Images
  • 20.9.4.0.4
  • 20.13.1
  • 20.9.4.1.1
  • 20.9.5
  • 20.9.5_LI_Images
  • 20.12.3_LI_Images
  • 20.12.3
  • 20.9.4.1.3
  • 20.6.7
  • 20.9.5.1
  • 20.9.5.1_LI_Images
  • 20.9.4.1.6
  • 20.14.1
  • 20.14.1_LI_Images
  • 20.9.5.2
  • 20.9.5.2.1
  • 20.9.5.2_LI_Images
  • 20.12.3.1
  • 20.12.4
  • 20.15.1_LI_Images
  • 20.15.1
  • 20.9.5.1.4
  • 20.9.5.2.7
  • 20.9.5.2.13
  • 20.9.6
  • 20.9.6_LI_Images
  • 20.9.5.2.14
  • 20.6.8
  • 20.12.4.0.03
  • 20.16.1
  • 20.16.1_LI_Images
  • 20.12.4_LI_Images
  • 20.9.5.2.16
  • 20.12.4.0.4
  • 20.12.401
  • 20.9.5.3
  • 20.9.5.3_LI_Images
  • 20.12.4.1_LI_Images
  • 20.12.4.1
  • 20.9.5.2.21
  • 20.9.6.0.3
  • 20.12.4.0.6
  • 20.15.2_LI_Images
  • 20.15.2
  • 20.12.4_Monthly_ES5
  • 20.12.5
  • 20.12.5_LI_Images
  • 20.9.7_LI _Images
  • 20.9.7
  • 20.15.3
  • 20.15.3_ LI _Images
  • 20.12.501
  • 20.12.5.1_LI_Images
  • 20.12.5.1
  • 20.12.5.2_LI_Images
  • 20.12.5.2
  • 20.15.3.1
  • 20.15.4_LI_Images
  • 20.15.4
  • 20.9.7.1_LI _Images
  • 20.9.7.1
  • 20.18.1
  • 20.18.1_LI_Images
  • 20.12.6_LI_Images
  • 20.12.6
  • 20.12.5.1.01
  • 20.9.8
  • 20.9.8_LI_Images
  • 20.18.2
  • 20.15.4.1_LI_Images
  • 20.15.4.1
  • 20.18.2_LI_Images
Problem Types
TypeCWE IDDescription
cweCWE-287Improper Authentication
Type: cwe
CWE ID: CWE-287
Description: Improper Authentication
Metrics
VersionBase scoreBase severityVector
3.110.0CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Version: 3.1
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits

The Cisco PSIRT is aware of limited exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability.

Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk
N/A
Hyperlink: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
kev
dateAdded:
2026-02-25
reference:
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127
government-resource
Hyperlink: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127
Resource:
government-resource
Details not found