Home/CWE/Unprotected Alternate Channel
Weakness

Unprotected Alternate Channel

CWE-420 · Base · Draft

The product protects a primary channel, but it does not use the same level of protection for an alternate channel.

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Weakness Relationships

Where this weakness sits in the CWE hierarchy. Walk up to broader classes or down to more specific variants.
Parent of this (broader)
ChildOfCWE-923 · Improper Restriction of Communication Channel to Intended Endpoints
Children (more specific)
ParentOfCWE-1299 · Missing Protection Mechanism for Alternate Hardware Interface
ParentOfCWE-421 · Race Condition During Access to Alternate Channel
ParentOfCWE-422 · Unprotected Windows Messaging Channel ('Shatter')
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CVEs With This Weakness

38
A sample of the 38 CVEs tagged with this weakness.
CVECVE-2026-43505
CVECVE-2026-40435
CVECVE-2026-40217
CVECVE-2026-35388
CVECVE-2026-25916
CVECVE-2025-8557
CVECVE-2025-67303
CVECVE-2025-66432
CVECVE-2025-62820
CVECVE-2025-62001
CVECVE-2025-59033
CVECVE-2025-56558
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Nuclei Scanner Templates

1
Open-source Nuclei templates that detect this weakness class - an actionable scan-for-it pivot. Licensed under the ProjectDiscovery / Nuclei terms.
criticalComfyUI-Manager < 3.38 - Configuration Overwrite
External lookups - second-class, for what we don’t hold ourselves
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