CVE-2026-20127
CRITICAL Actively ExploitedCisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
CVSS v3
10
CRITICAL
EPSS Score
54.8%
exploit probability
CISA KEV
No
known exploited
Exploitation
active
SSVC status
Description
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
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 2/25/2026
- Last Modified
- 2/26/2026
- CERT-FR Advisory
- CERTFR-2026-ALE-002
- CERT-FR Link
- CERTFR-2026-ALE-002
Frequently Asked Questions
What is CVE-2026-20127?
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
Is CVE-2026-20127 actively exploited?
Yes. CVE-2026-20127 has been observed in active exploitation according to SSVC analysis.
What is the CVSS score for CVE-2026-20127?
CVE-2026-20127 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string 3.1.
Is CVE-2026-20127 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.