CVE-2020-36872
HIGH EPSS 34.5%
Published Nov 26, 20257mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
Published Nov 26, 2025 7mo ago
Last Modified Jun 17, 2026 1w ago
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 Details
Base Score
Exploitability
Impact
Vector string
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:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
34.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
References 6
- cxsecurity.com https://cxsecurity.com/issue/WLB-2020100045
- packetstormsecurity.com https://packetstormsecurity.com/files/159504
- bac-test.com https://www.bac-test.com/
- exploit-db.com https://www.exploit-db.com/exploits/48860
- vulncheck.com https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos
- zeroscience.mk https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.