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CVE-2026-20129 is a critical improper authentication vulnerability in the API user authentication component of Cisco Catalyst SD-WAN Manager. The flaw is caused by improper authentication handling for requests sent to the API, allowing authentication controls to be bypassed through a crafted API request. A remote unauthenticated attacker can exploit the issue to gain access to an affected system as a user with the netadmin role and then execute commands with netadmin privileges. Cisco states that releases 20.18 and later are not affected.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unauthenticated remote access vulnerability in Cisco Catalyst SD-WAN (API) that can grant access as a netadmin-role user via crafted API requests (CVSS 9.8 per the content).
Improper API request authentication vulnerability in Cisco Catalyst SD-WAN Manager that allows a remote unauthenticated attacker to execute commands as the netadmin user.
A Cisco Catalyst SD-WAN Manager vulnerability referenced as receiving patches, but not otherwise described in the content.
A critical vulnerability affecting Cisco Catalyst SD-WAN products that can allow an attacker to bypass authentication, escalate privileges to administrator level, and take control of the device.
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.