CVE-2026-20304
Received Received - Intake

Improper Access Control in Cisco Catalyst SD-WAN

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Cisco Systems, Inc.

Description
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.

CVSS Scores

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-20304
EUVD
EUVD-2026-53460

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
cisco catalyst_sd-wan *
cisco catalyst_sd-wan_software *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

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Executive Summary

CVE-2026-20304 is an improper access control vulnerability in Cisco Catalyst SD-WAN. It allows unauthorized access due to weak permission checks, potentially letting attackers bypass security controls and gain elevated privileges.

Impact Analysis

This vulnerability could allow attackers to access sensitive data, modify configurations, or disrupt network operations. The high CVSS score (9.9) indicates severe impact, including confidentiality, integrity, and availability breaches.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. However, improper access control (CWE-284) can lead to unauthorized data access, which may violate confidentiality requirements in GDPR and HIPAA.

Mitigation Strategies

Apply the latest Cisco Catalyst SD-WAN software update addressing CWE-284 improper access control issues. Monitor Cisco PSIRT advisories for patches and follow hardening guidelines provided by Cisco.

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