CVE-2026-41503
HighSummary
W bibliotece BACnet Stack przed wersją 1.4.3 występuje podatność na odczyt poza granicami bufora w dekoderze usługi ReadPropertyMultiple. Umożliwia to nieautoryzowanym atakującym zdalne odczytywanie danych poza przydzielonymi granicami bufora poprzez wysłanie zmodyfikowanego żądania RPM.
Risk Assessment
Podatność ta może prowadzić do awarii urządzeń wbudowanych korzystających z protokołu BACnet, co może zakłócić działanie systemów automatyki budynkowej. Atakujący mogą wykorzystać tę lukę do destabilizacji systemów i uzyskania nieautoryzowanego dostępu do danych.
Recommendation
Zaleca się aktualizację biblioteki BACnet Stack do wersji 1.4.3 lub nowszej, aby usunąć tę podatność. Należy również rozważyć ograniczenie dostępu do usługi ReadPropertyMultiple w celu zminimalizowania ryzyka.
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Original NVD description (English source)
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

