Cisco Catalyst SD-WAN Software Security Hardening Release: August 2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.

These vulnerabilities were found during internal testing and are not known to be actively exploited. To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID) to each CWE grouping.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

CVE-2026-20310 — Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access (CVSS 3.1 9.1, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) CVE-2026-20303 — Cisco Catalyst SD-WAN Security Hardening Release - Input Validation Vulnerabilities (CVSS 3.1 9.9, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) CVE-2026-20304 — Cisco Catalyst SD-WAN Security Hardening Release - Access Control Vulnerabilities (CVSS 3.1 9.9, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) CVE-2026-20312 — Cisco Catalyst SD-WAN Security Hardening Release - Information Disclosure Vulnerabilities (CVSS 3.1 8.8, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) CVE-2026-20313 — Cisco Catalyst SD-WAN Security Hardening Release - Memory Corruption Vulnerabilities (CVSS 3.1 7.7, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)