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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00233.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
BACnet Interoperability Test Services, Inc. BACnet Test Server unaffected
Version Status Constraints
0 affected ≤ 1.01

No data.

No data.

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Vendors Products
Bacnet Test Subscribe
Test Server Subscribe

Project Subscriptions

Vendors Products
Bacnet Test Subscribe
Test Server Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cxsecurity.com/issue/WLB-2020100045 cve-icon cve-icon
https://packetstormsecurity.com/files/159504 cve-icon cve-icon
https://www.bac-test.com/ cve-icon cve-icon
https://www.exploit-db.com/exploits/48860 cve-icon cve-icon
https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos cve-icon cve-icon
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php cve-icon cve-icon
History

Fri, 28 Nov 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 28 Nov 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Bacnet Test
Bacnet Test test Server
Vendors & Products Bacnet Test
Bacnet Test test Server

Wed, 26 Nov 2025 22:30:00 +0000

Type Values Removed Values Added
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.
Title BACnet Test Server 1.01 Malformed BVLC Length DoS
Weaknesses CWE-400
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2025-11-28T19:22:56.721Z

Reserved: 2025-10-30T15:45:57.763Z

Link: CVE-2020-36872

cve-icon Vulnrichment

Updated: 2025-11-28T19:22:46.878Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-11-26T23:15:47.227

Modified: 2025-12-01T15:39:33.110

Link: CVE-2020-36872

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-11-28T08:51:35Z

Weaknesses