A severe train brake hack vulnerability threatens North America’s rail system. Researchers say attackers could stop or derail trains using cheap radio gear.
Security researcher Neil Smith identified the issue over a decade ago. His warnings were largely ignored—until now.
Smith recently explained that the flaw lies in the outdated radio signals used by End-of-Train (EoT) and Head-of-Train (HoT) devices. These components manage braking across long freight trains. The problem: the signals are unauthenticated and unencrypted.
A Simple Exploit With Huge Consequences
An attacker with less than $500 in hardware can spoof commands and stop a train remotely. These devices use plain-text telemetry packets to communicate across the train’s length—sometimes spanning three miles.
Because no proper security protocols are in place, a hacker can send forged brake commands, potentially causing derailments or complete network shutdowns.
“This RF link is peak 1980s security,” Smith noted in a detailed post. “Why bother with encryption when it’s just illegal to transmit on the frequency?”
CISA Confirms the Vulnerability
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) confirmed the threat and assigned it CVE-2025-1727. It has a severity score of 8.1 out of 10.
CISA warned that attackers could:
- Send remote brake commands
- Cause sudden stops or system failures
- Disrupt rail operations without physical access
The vulnerability isn’t yet listed in the Known Exploited Vulnerabilities Catalog, meaning there’s no evidence of real-world abuse in the U.S.—yet.
Fix Will Take Years and Billions
The Association of American Railroads (AAR) is planning to replace 75,000 devices using the outdated protocol. The process will take five to seven years and cost as much as $10 billion.
The new IEEE 802.16t protocol promises encryption, authentication, and lower latency—but deployment will be slow.
The problem mirrors a 2023 incident in Poland, where hackers halted 20 trains by spoofing analog radio commands. That attack caused derailments and injuries.
Conclusion
The train brake hack vulnerability is a stark warning about outdated infrastructure in critical transportation networks.
With over 75,000 vulnerable devices in use, U.S. rail operators face urgent decisions. Researchers, regulators, and vendors now recognize the risk—but the clock is ticking. A successful exploit could disrupt supply chains, cause injuries, or lead to catastrophic derailments.
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