CVE-2020-36872
BACnet Test Server 1.01 Malformed BVLC Length DoS
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.7EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
26 Nov 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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
Affected products
BACnet Interoperability Test Services, Inc. · BACnet Test ServerReferences
https://cxsecurity.com/issue/WLB-2020100045https://packetstormsecurity.com/files/159504https://www.bac-test.com/https://www.exploit-db.com/exploits/48860https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-doshttps://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php