BACnet-stack MS/TP reply matcher OOB read_CVE-2025-66624

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2025-66624

Source GitHub_M

Published Dec 5, 2025 at 18:36

Modified Dec 5, 2025 at 20:10

Affected Product

Vendor bacnet-stack

Product bacnet-stack

Version < 1.5.0.rc2

Affected Versions bacnet-stack bacnet-stack < 1.5.0.rc2

CWE Classification

CWE-125

References

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    "published": "2025-12-05T18:36:26.280Z",
    "modified": "2025-12-05T20:10:57.553Z",
    "type": "cve",
    "title": "BACnet-stack MS/TP reply matcher OOB read",
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    "references": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg\nhttps://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48",
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