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10.0
Cisco SD-WAN Software Allows Attackers to Gain Administrator Access
Known exploited
CVE-2026-20127
CVE-2026-20127
Summary
Certain Cisco SD-WAN software has a flaw that lets hackers gain full control over the system without needing a password. This could let them change network settings, which could disrupt business operations. Update your software to the latest version to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| cisco | catalyst sd-wan controller and manager | All versions | – |
| cisco | catalyst_sd-wan_manager | <= 20.9.8.2 | – |
| cisco | catalyst_sd-wan_manager | > 20.11 , <= 20.12.5.3 | – |
| cisco | catalyst_sd-wan_manager | > 20.13 , <= 20.15.4.2 | – |
| cisco | catalyst_sd-wan_manager | > 20.16 , <= 20.18.2.1 | – |
| cisco | catalyst_sd-wan_manager | 20.12.6 | – |
| cisco | sd-wan_vsmart_controller | <= 20.9.8.2 | – |
| cisco | sd-wan_vsmart_controller | > 20.11 , <= 20.12.5.3 | – |
| cisco | sd-wan_vsmart_controller | > 20.13 , <= 20.15.4.2 | – |
| cisco | sd-wan_vsmart_controller | > 20.16 , <= 20.18.2.1 | – |
| cisco | sd-wan_vsmart_controller | 20.12.6 | – |
Original title
Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability
Original 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.
Vulnerability type
CWE-287
Improper Authentication
Published: 25 Feb 2026 · Updated: 14 Mar 2026 · First seen: 6 Mar 2026