High 8.7Published Nov 26, 2025

CVE-2020-36872BACnet Test Server 1.01 Malformed BVLC Length DoS

Updated under an hour ago (Oct 28, 2026, 1:23 PM ET)

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It affects BACnet Interoperability Test Services, Inc. BACnet Test Server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for BACnet Interoperability Test Services, Inc. BACnet Test Server

Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

BACnet Interoperability Test Services, Inc. BACnet Test Server bacnet_interoperability_test_services:bacnet_test_server (from the name)	through 1.01	CNA record

References

References

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php	technical-description, exploit
https://www.exploit-db.com/exploits/48860	exploit
https://packetstormsecurity.com/files/159504	exploit
https://cxsecurity.com/issue/WLB-2020100045	exploit
https://www.bac-test.com/	product
https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.