CVE-2020-36872

high

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.

References

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php

https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos

https://www.exploit-db.com/exploits/48860

https://www.bac-test.com/

https://packetstormsecurity.com/files/159504

https://cxsecurity.com/issue/WLB-2020100045

Details

Source: Mitre, NVD

Published: 2025-11-26

Updated: 2026-04-15

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High

EPSS

EPSS: 0.00156