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CVE-2026-20127
CVE
Critical KEVConfirmedExploit available

A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, f…

CVSS
10.0
Critical
EPSS
0.48
p98
Published
2026-01-01
Updated
2026-02-25
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. 

Tags · CWE
KEVPre-auth
CWE-287
CAPEC-22
CAPEC-57
CAPEC-94
CAPEC-114
CAPEC-115
CAPEC-151
CAPEC-194
CAPEC-593
CAPEC-633
CAPEC-650
Affected products
Catalyst_sd-wan_manager < 20.9.8.2Catalyst_sd-wan_manager 20.11–20.12.5.3Catalyst_sd-wan_manager 20.13–20.15.4.2Catalyst_sd-wan_manager 20.16–20.18.2.1Catalyst_sd-wan_managerSd-wan_vsmart_controller < 20.9.8.2Sd-wan_vsmart_controller 20.11–20.12.5.3Sd-wan_vsmart_controller 20.13–20.15.4.2Sd-wan_vsmart_controller 20.16–20.18.2.1Sd-wan_vsmart_controller
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-02-25
Added to KEV
2026-02-25
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: C
Changed (C)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.482 · p98
Known exploited (KEV)
Yes
MITRE ATT&CK
Inferred via CAPEC
└ via CAPEC-57 · CWE-287
└ via CAPEC-633 · CWE-287
└ via CAPEC-593 · CWE-287
└ via CAPEC-650 · CWE-287
└ via CAPEC-114 · CWE-287
└ via CAPEC-593 · CWE-287
└ via CAPEC-94 · CWE-287
└ via CAPEC-593 · CWE-287
Known exploits — Сканер-ВС
CVE-2026-20127
github-poc · https://github.com/0xBlackash/CVE-2026-20127
Enterprise
Affected products
ProductVendorStatus
catalyst_sd-wan_manager*Exploited
sd-wan_vsmart_controller*Exploited