Critical Cisco SD-WAN Flaws Expose Systems to Access Control Bypass Attacks

Cisco has issued critical security updates for its Catalyst SD-WAN Software to address several severe vulnerabilities that could allow attackers to bypass access control, escalate privileges, and expose sensitive data.

The most critical vulnerabilities are CVE-2026-20303, CVE-2026-20304, and CVE-2026-20310, each with a maximum CVSS v3.1 score of 9.9. These flaws were discovered through internal security testing using advanced AI models.

Cisco's Product Security Incident Response Team (PSIRT) has stated that there are no known public exploit disclosures or malicious exploitation concerning these specific CVEs, but rapid patching is crucial due to the widespread impact of these vulnerabilities and the lack of workarounds.