CVE-2025-66624 (GCVE-0-2025-66624)

Vulnerability from cvelistv5 – Published: 2025-12-05 18:36 – Updated: 2025-12-08 17:28
VLAI
Title
BACnet-stack MS/TP reply matcher OOB read
Summary
BACnet Protocol Stack library provides a BACnet application layer, network layer and media access (MAC) layer communications services. Prior to 1.5.0.rc2, The npdu_is_expected_reply function in src/bacnet/npdu.c indexes request_pdu[offset+2/3/5] and reply_pdu[offset+1/2/4] without verifying that those APDU bytes exist. bacnet_npdu_decode() can return offset == 2 for a 2-byte NPDU, so tiny PDUs pass the version check and then get read out of bounds. On ASan/MPU/strict builds this is an immediate crash (DoS). On unprotected builds it is undefined behavior and can mis-route replies; RCE is unlikely because only reads occur, but DoS is reliable.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-08 17:28 UTC
CWE
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
bacnet-stack bacnet-stack Affected: < 1.5.0.rc2
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