CVE-2025-66624 - BACnet-stack MS/TP reply matcher OOB read

CVE-2025-66624 - BACnet-stack MS/TP reply matcher OOB read

https://cvefeed.io/rssfeed/latest.atom / Fri, 12/05/2025 - 22:51
CVE ID : CVE-2025-66624
Published : Dec. 5, 2025, 7:15 p.m. | 2 hours, 35 minutes ago
Description : 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
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