Auth bypass in Atn-B1 Cpdlc

CVE-2025-71409

Lack of authentication for Very High Frequency Data Link messages allows rogue ground stations to inject CPDLC messages leading to unexpected or misleading clearances and potential pilot confusion. This type of attack can be carried out remotely over radio frequency.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L.

EPSS exploit prediction

EPSS: 0.003 (26.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-71409: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-71409?
CVE-2025-71409 is a high-severity vulnerability in Atn-B1 Cpdlc, classified under Missing Authentication for Critical Function. CVSS score: 7.1/10. Published 2026-08-07.
How severe is CVE-2025-71409?
High severity. CVSS v3 base score is 7.1 out of 10.