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CVE-2026-20303 is a Cisco Catalyst SD-WAN Software security-hardening vulnerability grouping for multiple internally discovered improper input validation weaknesses, including related path-traversal and externally controlled file-path conditions. It affects Cisco Catalyst SD-WAN Manager and Controller deployments across deployment models, irrespective of device configuration. Cisco assigned a CVSS v3.1 score of 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
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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 valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
20 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.