CVE-2026-20182
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required 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.
CISA 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
Description
May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks. 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 the 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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Controller | 20.6.4 20.9.2 20.3.6 20.7.2 20.7.1 20.5.1 20.6.2 19.3.0 20.6.1 17.2.4 18.2.0 18.4.6 19.1.0 19.2.4 19.2.929 18.3.8 18.4.303 18.3.7 18.4.1 19.2.097 19.2.0 19.2.099 18.3.6 20.4.2 19.0.0 20.9.1 20.3.5 20.3.1 18.3.5 20.6.3 18.4.3 18.4.4 18.3.3 17.2.8 20.8.1 19.2.32 19.2.2 17.2.5 18.4.0 20.4.1.1 20.1.3 20.1.2 17.2.10 19.2.098 20.1.1 17.2.6 19.2.1 18.3.4 20.4.1 17.2.9 19.2.31 19.0.1a 18.3.0 17.2.7 18.4.5 20.3.4 20.3.3 20.4.1.2 20.3.2 18.3.1 20.1.12 19.2.3 20.10.1 20.6.5 20.3.7 20.9.3 20.11.1 20.6.3.2 20.4.2.3 20.3.5.1 20.3.4.3 20.9.3.1 20.6.4.1 20.3.3.2 20.6.5.2 20.3.7.1 20.11.1.1 20.10.1.1 20.6.1.2 20.1.3.1 20.9.2.2 20.6.5.3 20.6.3.3 20.3.7.2 20.6.5.4 20.9.2.3 20.9.4 20.12.1 20.3.8 20.6.6 20.12.2 20.13.1 20.9.5 20.12.3 20.6.7 20.9.5.1 20.14.1 20.12.3.1 20.12.4 20.15.1 20.9.6 20.6.8 20.16.1 20.9.5.3 20.12.4.1 20.15.2 20.12.5 20.9.7 20.15.3 20.12.5.1 20.12.5.2 20.15.4 20.9.7.1 20.12.6 20.9.8 20.15.4.1 20.15.4.2 20.12.5.3 20.12.6.1 20.9.8.2 20.15.5 20.12.7 20.9.9 20.15.5.1 20.15.4.3 20.15.4.5 20.15.5.3 20.12.7.2 20.9.9.2 |
| Cisco | Cisco Catalyst SD-WAN Manager | 20.1.12 19.2.1 18.4.4 18.4.5 20.1.1.1 20.1.1 19.2.099 18.3.6 18.3.7 19.2.0 19.1.0 18.4.303 19.2.098 18.3.6.1 18.2.0 17.2.8 18.3.3.1 18.4.0 18.3.1 17.2.6 17.2.9 17.2.5 18.4.0.1 18.3.3 18.3.0 19.2.3 18.4.501_ES 20.1.2 19.2.929 19.2.31 20.3.2 19.2.4 19.2.4.0.9 20.1.3.1 |
References
2 LinksRecord Details
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