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Vulnerability record · CVE-2020-36872 · published 26 November 2025

CVE-2020-36872: Uncontrolled resource consumption vulnerability

BACnet Test Server versions up to and including 1.01 contains a remote denial of service vulnerability in its BACnet/IP BVLC packet handling. The server fails to properly validate the BVLC Length field in incoming UDP BVLC frames on the default BACnet port (47808/udp). A remote unauthenticated attacker can send a malformed BVLC Length value to trigger an access violation and crash the application, resulting in a denial of service.

8.7 CVSS 4.0 High EPSS 0.50% · top 59.8% CWE-400 · Uncontrolled resource consumption Deferred
8.7CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

BACnet Test Server versions up to and including 1.01 contains a remote denial of service vulnerability in its BACnet/IP BVLC packet handling. The server fails to properly validate the BVLC Length field in incoming UDP BVLC frames on the default BACnet port (47808/udp). A remote unauthenticated attacker can send a malformed BVLC Length value to trigger an access violation and crash the application, resulting in a denial of service.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://cxsecurity.com/issue/WLB-2020100045
https://packetstormsecurity.com/files/159504
https://www.bac-test.com/
https://www.exploit-db.com/exploits/48860
https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php

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Source: NIST National Vulnerability Database (record CVE-2020-36872), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.