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

Technical Severity

CVSS v3.1 Metrics

CRITICAL

10 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

77.32 %

Predictive Probability

Percentile Rank

99.0 th

Documented as more likely to be exploited than 99.0% of known CVEs.

Detection Date

May 14, 2026

Remediation Due

May 17, 2026

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

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.

External Intelligence

CISA

CISA Advisory

https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems

CISA

CISA Advisory

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

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2026-20182