CVE-2020-36872

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 v4.0

8.7 HIGHCVSS: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:X/V:X/RE:X/U:X

EPSS

0.49% chance of exploitation in the next 30 days, 40th percentile

Published

2025-11-26

Updated

2026-07-28

Proof-of-concept exploits (4)

• https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php
• https://www.exploit-db.com/exploits/48860
• https://packetstormsecurity.com/files/159504
• https://cxsecurity.com/issue/WLB-2020100045

References

• CVE Record
• NVD entry

Related

• CVE-2020-36871
• CVE-2020-36873
• CVE-2020-36855
• CVE-2020-36874
• CVE-2020-36849
• CVE-2020-36875