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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 security hardening releases. The issue affects Cisco Catalyst SD-WAN Manager and Cisco Catalyst SD-WAN Controller across multiple supported deployment models. Cisco classifies the weakness as CWE-20 and indicates the grouped issues include related input-handling weaknesses such as path traversal and external control of file paths. The vulnerability is remotely exploitable and has a CVSS v3.1 base score of 9.9. The published CVSS vector indicates network-based exploitation with low attack complexity, low privileges required, no user interaction, changed scope, and high impact to confidentiality, integrity, and availability.
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No public exploit code observed for this vulnerability.
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A critical Catalyst SD-WAN vulnerability described as improper input validation.
A critical Cisco Catalyst SD-WAN Software vulnerability grouped under improper input validation, including path traversal and external control of file paths.
An improper input validation vulnerability in Cisco Catalyst SD-WAN Software.
A critical, remotely exploitable improper input validation vulnerability group in Cisco Catalyst SD-WAN software addressed through Cisco security hardening releases.
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.