CVE-2026-20182
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
At a glance
- Source
- NVD
- EPSS
- EPSS 91.82 % · percentile 100 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisco
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-287 — Improper Authentication
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | cisco |
| CVSS 3.1 | CRITICAL 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · psirt@cisco.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-30324
- GCVE · GCVE-0-2026-20182
CERT-FR advisories
- CERTFR-2026-AVI-0594 — Multiples vulnérabilités dans les produits Cisco · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*< 20.9.9.1cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 20.10 < 20.12.5.4cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 20.12.6 < 20.12.6.2cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 20.13 < 20.15.4.4cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 20.15.5 < 20.15.5.2cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 20.16 < 20.18.2.2cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*≥ 26.1 < 26.1.1.1cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.7:*:*:*:*:*:*:*cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*< 20.9.9.1cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 20.10 < 20.12.5.4cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 20.12.6 < 20.12.6.2cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 20.13 < 20.15.4.4cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 20.15.5 < 20.15.5.2cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 20.16 < 20.18.2.2cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:*:*:*:*:*:*:*:*≥ 26.1 < 26.1.1.1cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:20.12.7:*:*:*:*:*:*:*cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*< 20.9.9.1cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 20.10 < 20.12.5.4cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 20.12.6 < 20.12.6.2cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 20.13 < 20.15.4.4cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 20.15.5 < 20.15.5.2cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 20.16 < 20.18.2.2cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:*≥ 26.1 < 26.1.1.1cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.7:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Cisco · Cisco Catalyst SD-WAN Controller | affected 20.6.4 ; affected 20.9.2 ; affected 20.3.6 ; affected 20.7.2 ; affected 20.7.1 ; affected 20.5.1 |
| Cisco · Cisco Catalyst SD-WAN Manager | affected 20.1.12 ; affected 19.2.1 ; affected 18.4.4 ; affected 18.4.5 ; affected 20.1.1.1 ; affected 20.1.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |