CVE-2026-20303: Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities
Published Aug 5, 2026
·Updated
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-2026-20303 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-20.
Affected Software
1 affected component
Cisco Catalyst SD-WAN Security Hardening Release
Event History
Aug 5, 2026
CVE Published
via MITRE·04:29 PM
Data Sourced
via MITRE·04:29 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2026-20303?
CVE-2026-20303 has a critical severity rating of 9.9.
2
How do I fix CVE-2026-20303?
To fix CVE-2026-20303, update to the latest security hardening release of Cisco Catalyst SD-WAN.
3
What type of vulnerabilities are addressed in CVE-2026-20303?
CVE-2026-20303 addresses input validation vulnerabilities.
4
What is the risk level associated with CVE-2026-20303?
CVE-2026-20303 has a risk level of 82.
5
When was CVE-2026-20303 published?
CVE-2026-20303 was published on August 5, 2026.