Loading vulnerability…
CVE-2026-20303 is a critical vulnerability grouping in Cisco Catalyst SD-WAN Software that covers multiple internally discovered improper input validation flaws addressed through a security hardening release. The issue affects Cisco Catalyst SD-WAN Manager and Cisco Catalyst SD-WAN Controller across deployment models regardless of device configuration. Cisco indicates the grouped weaknesses fall under CWE-20 and may also encompass related input-handling problems such as path traversal and externally controlled file path handling. The vulnerability is remotely exploitable and arises from insufficient validation of data received from a user or external system, which can allow unsafe input to reach protected functionality or sensitive resources.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of a cluster of critical vulnerabilities in Cisco Catalyst SD-WAN Software addressed in Cisco's August 5, 2026 security bundle.
A critical authentication-related vulnerability in Cisco Catalyst SD-WAN that could allow attackers to access otherwise restricted areas.
A critical improper input validation vulnerability affecting Cisco Catalyst SD-WAN Software.
A critical Catalyst SD-WAN vulnerability described as improper input validation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.