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CVE-2026-20313 is a high-severity vulnerability in Cisco Catalyst SD-WAN Software caused by improper validation of a specified quantity in input. It was identified during an internal security review and addressed as part of Cisco software hardening releases. The issue affects Cisco Catalyst SD-WAN Software across deployment models, and no configuration setting or feature toggle is indicated to remove exposure. Specific vulnerable functions or code paths are not publicly described in the available information.
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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.
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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper validation of specified quantity in input vulnerability affecting Cisco Catalyst SD-WAN Software.
A high-severity Catalyst SD-WAN vulnerability involving improper validation of specified quantity in input.
A Cisco Catalyst SD-WAN Software vulnerability involving improper validation of a specified quantity in input.
An improper validation of specified quantity in input vulnerability in Cisco Catalyst SD-WAN Software.
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.