Vulnerability Details CVE-2026-21878
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 11.0%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-21878
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cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0