BACnet Test Server 1.01 Malformed BVLC Length DoS
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Gjoko Krstic of Zero Science Lab
References
- 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
- https://www.bac-test.com/
- https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos
Affected Vendor
BACnet Interoperability Test Services, Inc.
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