CVE-2026-20182—Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Vulnerability Name

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

Description

Cisco Catalyst SD-WAN Controller & Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Additional Notes

• CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems
• https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW
• https://nvd.nist.gov/vuln/detail/CVE-2026-20182

Related News Articles

• Cisco Catalyst SD-WAN Zero-Day CVE-2026-20245 Exploited to Gain Root AccessJune 25, 2026
• Mandiant reveals how Cisco SD-WAN zero-day attacks gained root accessJune 24, 2026
• Cisco Releases Security Updates for Actively Exploited SD-WAN Manager FlawJune 16, 2026
• Cisco fixes SD-WAN vManage flaw exploited in zero-day attacksJune 15, 2026
• Cisco Catalyst SD-WAN Manager CVE-2026-20245 Flaw Actively Exploited – No Patch AvailableJune 6, 2026

Related Weaknesses

• CWE-287