CVE-2026-20182
Full vulnerability record from the local CVENow database.
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
CRITICAL
CVSS score
10.0
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-05-14 17:16:19.387000
Last modified
2026-10-26 14:10:00.130000
View original CVE JSON
{
"id": "CVE-2026-20182",
"sourceIdentifier": "[email protected]",
"published": "2026-05-14T17:16:19.387",
"lastModified": "2026-10-26T14:10:00.130",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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. \r\n\r\nA 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.\r\nThis 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."
},
{
"lang": "es",
"value": "Mayo de 2026: Este aviso de seguridad proporciona los detalles y la información de la solución para una vulnerabilidad que fue descubierta y solucionada después de que la fuera divulgada en febrero de 2026. Este nuevo aviso es para una nueva vulnerabilidad en el establecimiento de la conexión de control. La sección de este aviso incluye orientación sobre ’Show Control Connections’ para ayudar con las comprobaciones del sistema. \n\nUna vulnerabilidad en la autenticación de emparejamiento en Cisco Catalyst SD-WAN Controller, anteriormente SD-WAN vSmart, y Cisco Catalyst SD-WAN Manager, anteriormente SD-WAN vManage, podría permitir a un atacante remoto no autenticado eludir la autenticación y obtener privilegios administrativos en un sistema afectado.\nEsta vulnerabilidad existe porque el mecanismo de autenticación de emparejamiento en un sistema afectado no funciona correctamente. Un atacante podría explotar esta vulnerabilidad enviando solicitudes manipuladas al sistema afectado. Un exploit exitoso podría permitir al atacante iniciar sesión en un Cisco Catalyst SD-WAN Controller afectado como una cuenta de usuario interna, con altos privilegios y no root. Usando esta cuenta, el atacante podría acceder a NETCONF, lo que luego permitiría al atacante manipular la configuración de red para la estructura SD-WAN."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
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"source": "[email protected]",
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"privilegesRequired": "NONE",
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"scope": "CHANGED",
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"cisaExploitAdd": "2026-05-14",
"cisaActionDue": "2026-05-17",
"cisaRequiredAction": "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.",
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{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
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"value": "CWE-287"
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],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk",
"source": "[email protected]",
"tags": [
"Not Applicable"
]
},
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
},
{
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182",
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
]
}
]
}