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

[event] 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.

> AFFECTED SOFTWARE

> MITIGATION

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.

Due Date: 2026-05-17

> REFERENCES

• [1] https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-ci...
• [2] https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt...
• [3] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ci...
• [4] https://nvd.nist.gov/vuln/detail/CVE-2026-20182