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CVE-2026-20304 is a critical improper access control vulnerability group affecting Cisco Catalyst SD-WAN Controller and Cisco Catalyst SD-WAN Manager. The issue was identified during an internal security review and addressed as part of a software hardening release. Cisco groups multiple related authorization, authentication, privilege, and bypass weaknesses under this single CVE and maps them to CWE-284. The vulnerability is remotely exploitable and has a CVSS v3.1 score of 9.9 with vector AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H, indicating low attack complexity, no user interaction, changed scope, and high impact across confidentiality, integrity, and availability.
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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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
An improper access control vulnerability in Cisco Catalyst SD-WAN Software.
A critical, remotely exploitable improper access control vulnerability grouping in Cisco Catalyst SD-WAN products addressed through a security hardening release.
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.