What is CVE-2025-66624?

CVE-2025-66624 is a high-severity vulnerability in Bacnet-stack, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2025-12-05.

How severe is CVE-2025-66624?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Bacnet-stack

CVE-2025-66624

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+…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (24.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Bacnet-stack — versions < 1.5.0.rc2

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8wgw-5h6x-qgqg (x_refsource_CONFIRM)
https://github.com/bacnet-stack/bacnet-stack/commit/9378f7d1e70169ebde4a5090bae7603703eadf48 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66624?: CVE-2025-66624 is a high-severity vulnerability in Bacnet-stack, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2025-12-05.
How severe is CVE-2025-66624?: High severity. CVSS v3 base score is 7.5 out of 10.