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CPDLC over ATN-B1 Vulnerabilities

calendar_today August 7, 2026 person CISA domain cybersecurity-and-infrastructure-security-agency

View CSAF Summary ATN-B1 CPDLC relies on legacy clear text unauthenticated radio frequency links. Research demonstrates that these characteristics allow unauthorized message injection, denial-of-service conditions, and forced session resets. These vulnerabilities do not constitute an unsafe aircraft condition but can degrade operational safety margins by increasing workload, delaying safety-critical instructions, and reducing situational awareness.

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