CVE-2026-20310
Received Received - Intake

Improper Link Resolution Before File Access 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 software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.

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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-2026-20310
EUVD
EUVD-2026-53471

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
cisco catalyst_sd-wan *
cisco catalyst_sd-wan_software to 9.9 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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Executive Summary

CVE-2026-20310 is a vulnerability in Cisco Catalyst SD-WAN related to improper link resolution before file access. This means the system may incorrectly process file paths or links, potentially allowing unauthorized access to files or resources.

Detection Guidance

Detection methods are not specified in the provided CVE details. Cisco recommends reviewing their official security advisories for guidance on detecting CVE-2026-20310 in Cisco Catalyst SD-WAN products.

Impact Analysis

This vulnerability could allow attackers to access sensitive files or execute unauthorized actions on the system. With a high CVSS score of 9.1, it poses significant risk including data breaches, system compromise, or disruption of services.

Compliance Impact

The vulnerability (CVE-2026-20310) involves improper link resolution before file access (CWE-59), which could allow unauthorized access or manipulation of sensitive data. This may impact compliance with GDPR (data protection) and HIPAA (healthcare data privacy) by potentially exposing or altering protected information.

Mitigation Strategies

Apply the latest Cisco Catalyst SD-WAN software updates provided by Cisco to address the improper link resolution issues. Monitor Cisco's security advisories for patches and follow their hardening recommendations.

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