What’s Vulnerable › Vulnerabilities
CVE-2020-36872: BACnet Test Server 1.01 Malformed BVLC Length DoS
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-11-26 · updated 2026-06-17
- Weakness: CWE-400
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.
Affected products
References
- https://cxsecurity.com/issue/WLB-2020100045
- https://packetstormsecurity.com/files/159504
- https://www.bac-test.com/
- https://www.exploit-db.com/exploits/48860
- https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php
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