EUVD-2026-53460
GHSA-pqwq-qr78-m9wc
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable management plane exploitable by an existing low-privileged account (PR:L, AC:L); improper access control on the fabric orchestrator justifies scope change and full C/I/A impact.
Primary rating from Vendor (cisco).
CVSS VectorVendor: cisco
Lifecycle Timeline
2DescriptionCVE.org
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20304 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.
AnalysisAI
Privilege escalation and authentication-boundary bypass in Cisco Catalyst SD-WAN Manager and SD-WAN Controller allows a low-privileged, remote authenticated attacker to abuse improper access-control checks (CWE-284) to reach functionality or data intended for higher-privileged roles, with full confidentiality, integrity, and availability impact (CVSS 9.9, scope changed). The flaw was discovered internally by Cisco during a proactive hardening review and shipped as part of a consolidated software-hardening release; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker already possess valid low-privileged authenticated access (CVSS PR:L) to the Cisco Catalyst SD-WAN Manager or SD-WAN Controller management/API interface and network reachability to it (AV:N); no user interaction and no elevated privileges are needed (UI:N, AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H = 9.9) signals a genuinely high-priority issue: network-reachable, low attack complexity, no user interaction, only low privileges required, and a scope change with total CIA impact - consistent with a management-plane device that governs the whole fabric. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Cisco Catalyst SD-WAN Manager and SD-WAN Controller to the fixed builds published in Cisco's software-hardening advisory (Patch available per vendor advisory: cisco-sa-hardening-sdwan-faLcR3K at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K); the exact patched version for your specific train is not enumerated in the available data, so map your running build against the advisory's fixed-release table before upgrading. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, complete an inventory of all Cisco Catalyst SD-WAN Manager and SD-WAN Controller instances and restrict console access to essential personnel only, implementing strict role-based access controls to prevent low-privileged users from accessing sensitive management functions. …
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Privilege escalation and cross-boundary information disclosure in Cisco Catalyst SD-WAN Manager and SD-WAN Controller st
Privileged file manipulation in Cisco Catalyst SD-WAN Manager and SD-WAN Controller allows an authenticated attacker to
Cleartext storage of sensitive information in Cisco Catalyst SD-WAN Controller and Manager exposes credentials or other
Remote availability disruption in Cisco Catalyst SD-WAN Manager and Controller allows a low-privileged authenticated att
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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