high7.5
CVE-2026-21878
BACnet Stack is a BACnet open source protocol stack C library for embedded systems.
Impact
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Bacnetstack | Bacnet Stack | Version 1.5.0 |