CVE-2026-20127 Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass
Unauthenticated remote attackers can bypass peering authentication to gain administrative privileges and manipulate SD-WAN network configurations.
- Exploited in the wild
- Since 25 Feb 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20127?
CVE-2026-20127 is a critical authentication bypass vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-20127?
It affects 3 products.
Products include Cisco Catalyst Sd-Wan Manager, Cisco Sd-Wan Vbond Orchestrator, Cisco Sd-Wan Vsmart Controller.
How do I fix CVE-2026-20127?
No fix has been published for CVE-2026-20127 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 27 Feb 2026.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-20127 being exploited?
Yes. Attackers have exploited CVE-2026-20127 in the wild since at least 25 Feb 2026.
Public exploit code: 1 Metasploit module and 9 proofs of concept on GitHub.
Other vulnerabilities in Cisco Catalyst Sd-Wan Manager
- CVE-2026-20182 Cisco Catalyst SD-WAN Controller Authentication Bypass
- CVE-2026-76504 Cisco Catalyst SD-WAN Manager Hex Encoding
- CVE-2026-20245 Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output
- CVE-2022-20775 Cisco SD-WAN Path Traversal
- CVE-2026-20128 Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format
Sources
Also known as GHSA-p4cq-46q3-jr7w.