Description
BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. In 1.4.2, 1.5.0.rc2, and earlier, an off-by-one stack-based buffer overflow in the ubasic interpreter causes a crash (SIGABRT) when processing string literals longer than the buffer limit. The tokenizer_string function in src/bacnet/basic/program/ubasic/tokenizer.c incorrectly handles null termination for maximum-length strings. It writes a null byte to dest[40] when the buffer size is only 40 (indices 0-39), triggering a stack overflow.
INFO
Published Date :
2026-02-13T17:58:37.205Z
Last Modified :
2026-02-13T18:19:36.183Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-21870 vulnerability.
| Vendors | Products |
|---|---|
| Bacnetstack |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21870.
