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CVE-2026-20127

Severity
CRITICAL
CVSS
10.0
EPSS
0.88243
Risk score
95.89
CISA KEV
Yes
PoC
No
Published
2026-02-25
Modified
2026-02-25
First seen
2026-08-07
Aliases
EUVD-2026-8675, GHSA-P4CQ-46Q3-JR7W
Products
Cisco:Catalyst SD-WAN Controller and Manager, Cisco:Cisco Catalyst SD-WAN Manager 17.2.6, Cisco:Cisco Catalyst SD-WAN Manager 17.2.7, Cisco:Cisco Catalyst SD-WAN Manager 18.3.4, Cisco:Cisco Catalyst SD-WAN Manager 18.3.7, Cisco:Cisco Catalyst SD-WAN Manager 18.4.6, Cisco:Cisco Catalyst SD-WAN Manager 19.2.3, Cisco:Cisco Catalyst SD-WAN Manager 19.2.4, Cisco:Cisco Catalyst SD-WAN Manager 19.2.4.0.1, Cisco:Cisco Catalyst SD-WAN Manager 19.2.4.0.9, Cisco:Cisco Catalyst SD-WAN Manager 20.1.2_937, Cisco:Cisco Catalyst SD-WAN Manager 20.10.1_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.12.2_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.12.3, Cisco:Cisco Catalyst SD-WAN Manager 20.12.3_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.12.4.0.03, Cisco:Cisco Catalyst SD-WAN Manager 20.12.4.0.6, Cisco:Cisco Catalyst SD-WAN Manager 20.12.4_Monthly_ES5, Cisco:Cisco Catalyst SD-WAN Manager 20.12.5.1, Cisco:Cisco Catalyst SD-WAN Manager 20.12.6_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.15.4, Cisco:Cisco Catalyst SD-WAN Manager 20.16.1, Cisco:Cisco Catalyst SD-WAN Manager 20.18.1_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.3.2.1_927, Cisco:Cisco Catalyst SD-WAN Manager 20.3.3.0.17, Cisco:Cisco Catalyst SD-WAN Manager 20.3.3.2, Cisco:Cisco Catalyst SD-WAN Manager 20.3.4.0.11, Cisco:Cisco Catalyst SD-WAN Manager 20.3.4.0.26, Cisco:Cisco Catalyst SD-WAN Manager 20.3.5.1, Cisco:Cisco Catalyst SD-WAN Manager 20.3.6, Cisco:Cisco Catalyst SD-WAN Manager 20.3.7.1, Cisco:Cisco Catalyst SD-WAN Manager 20.4.2.0.2, Cisco:Cisco Catalyst SD-WAN Manager 20.4.2.2, Cisco:Cisco Catalyst SD-WAN Manager 20.6.2.1, Cisco:Cisco Catalyst SD-WAN Manager 20.6.3.0.18, Cisco:Cisco Catalyst SD-WAN Manager 20.6.3.0.33, Cisco:Cisco Catalyst SD-WAN Manager 20.6.4.1, Cisco:Cisco Catalyst SD-WAN Manager 20.6.5.1.11, Cisco:Cisco Catalyst SD-WAN Manager 20.6.5.1.7, Cisco:Cisco Catalyst SD-WAN Manager 20.6.5.1.9, Cisco:Cisco Catalyst SD-WAN Manager 20.9.2.0.01, Cisco:Cisco Catalyst SD-WAN Manager 20.9.2.2, Cisco:Cisco Catalyst SD-WAN Manager 20.9.3.0.2, Cisco:Cisco Catalyst SD-WAN Manager 20.9.3.0.23, Cisco:Cisco Catalyst SD-WAN Manager 20.9.3.0.26, Cisco:Cisco Catalyst SD-WAN Manager 20.9.3.2_LI_Images, Cisco:Cisco Catalyst SD-WAN Manager 20.9.4, Cisco:Cisco Catalyst SD-WAN Manager 20.9.4.1.1, Cisco:Cisco Catalyst SD-WAN Manager 20.9.4.1.3, Cisco:Cisco Catalyst SD-WAN Manager 20.9.5, Cisco:Cisco Catalyst SD-WAN Manager 20.9.5.2.16
Sources
euvd EUVD-2026-8675
cisa.gov CVE-2026-20127

Description

Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, contain an authentication bypass vulnerability 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.

References