Is CVE-2026-20303 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-20303?

CVE-2026-20303 has a CVSS v3 severity of CRITICAL (9.9).

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CVE-2026-20303

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-2026-20303 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-20.