CVE-2020-36872 – BACnet Test Server 1.01 Malformed BVLC Length DoS

The following table lists the changes that have been made to the
CVE-2020-36872 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Nov. 26, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 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:X/V:X/RE:X/U:X
    Added CWE CWE-400
    Added Reference https://cxsecurity.com/issue/WLB-2020100045
    Added Reference https://packetstormsecurity.com/files/159504
    Added Reference https://www.bac-test.com/
    Added Reference https://www.exploit-db.com/exploits/48860
    Added Reference https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos
    Added Reference https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php
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