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CVE-2026-20304 is a critical improper access control vulnerability affecting Cisco Catalyst SD-WAN Software, including Cisco Catalyst SD-WAN Controller and Cisco Catalyst SD-WAN Manager. The issue was identified during an internal security review and is grouped by Cisco as a set of related access control weaknesses under CWE-284, including authorization, authentication, privilege, and bypass issues. The flaw allows insufficient enforcement of access restrictions within the SD-WAN management and control environment, enabling a low-privileged remote attacker to reach functionality or resources that should be restricted. Cisco addressed the issue through a software hardening release.
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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.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical authentication-related vulnerability in Cisco Catalyst SD-WAN that could allow attackers to access otherwise restricted areas.
A critical improper access control vulnerability affecting Cisco Catalyst SD-WAN Software.
A critical Catalyst SD-WAN vulnerability described as improper access control.
A critical Cisco Catalyst SD-WAN Software vulnerability grouped under improper access control, including authorization, authentication, privilege, and bypass issues.
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.