CVE-2020-36872
BACnet Test Server 1.01 Malformed BVLC Length DoS
- State
- Published
- Severity
- 8.7 High
- Published
- Nov 26, 2025
- Updated
- Jul 28, 2026
- Reserved
- Oct 30, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
BACnet Test ServerBACnet Interoperability Test Services, Inc. |
|
References
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.phptechnical-descriptionexploit
- https://www.exploit-db.com/exploits/48860exploit
- https://packetstormsecurity.com/files/159504exploit
- https://cxsecurity.com/issue/WLB-2020100045exploit
- https://www.bac-test.com/product
- https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dosthird-party-advisory
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