CVE-2017-8921: Flightgear

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

In FlightGear before 2017.2.1, the FGCommand interface allows overwriting any file the user has write access to, but not with arbitrary data: only with the contents of a FlightGear flightplan (XML). A resource such as a malicious third-party aircraft could exploit this to damage files belonging to the user. Both this issue and CVE-2016-9956 are directory traversal vulnerabilities in Autopilot/route_mgr.cxx - this one exists because of an incomplete fix for CVE-2016-9956.

Affected products

• Flightgear Flightgear: up to and including 2017.2

Published 2017-05-12. Last modified 2026-06-17.