CVE-2026-20127 - Vulnerability Analysis

Overview

Cisco Catalyst SD-WAN Controller and Manager contain an authentication bypass caused by improper peering authentication, letting unauthenticated remote attackers obtain administrative privileges, exploit requires sending crafted requests.

Severity & Score

Impact

Unauthenticated attackers can gain administrative access and manipulate network configurations, risking full control over the SD-WAN fabric.

Mitigation

Update to the latest available version that fixes the peering authentication mechanism.

References

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127
• https://blog.talosintelligence.com/uat-8616-sd-wan/
• https://media.defense.gov/2026/Feb/25/2003880301/-1/-1/0/CSA_Exploitation_of_SD-WAN_Appliances.PDF
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk

Social Media Activity(2 posts)

Metasploit

@metasploit

Apr 10, 2026

This week's release features a 2x faster msfvenom bootup time and new modules, including exploits for the Cisco Catalyst SD-WAN Controller Authentication Bypass (CVE-2026-20127) and osTicket Arbitrary File Read (CVE-2026-22200). https://www.rapid7.com/blog/post/pt-metasploit-wrap-up-04-10-2026/

View original post

Metasploit

@metasploit

Apr 10, 2026

This week's release features a 2x faster msfvenom bootup time and new modules, including exploits for the Cisco Catalyst SD-WAN Controller Authentication Bypass (CVE-2026-20127) and osTicket Arbitrary File Read (CVE-2026-22200). https://www.rapid7.com/blog/post/pt-metasploit-wrap-up-04-10-2026/

View original post

GitHub Repositories(6 repos)

• https://github.com/abrahamsurf/sdwan-scanner-CVE-2026-20127
• https://github.com/sfewer-r7/CVE-2026-20127
• https://github.com/BugFor-Pings/CVE-2026-20127_EXP
• https://github.com/yonathanpy/CVE-2026-20127-Cisco-SD-WAN-Preauth-RCE
• https://github.com/zerozenxlabs/CVE-2026-20127---Cisco-SD-WAN-Preauth-RCE
• https://github.com/randeepajayasekara/CVE-2026-20127

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner