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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.

PUBLISHED Reserved 2025-10-30 | Published 2025-11-26 | Updated 2025-11-28 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-400 Uncontrolled Resource Consumption

Product status

Default status
unaffected

Any version
affected

Timeline

2020-06-10:Exploit is publicly disclosed

Credits

Gjoko Krstic of Zero Science Lab finder

References

www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php technical-description exploit

www.exploit-db.com/exploits/48860 exploit

packetstormsecurity.com/files/159504 exploit

cxsecurity.com/issue/WLB-2020100045 exploit

www.bac-test.com/ product

www.vulncheck.com/...t-test-server-malformed-bvlc-length-dos third-party-advisory

cve.org (CVE-2020-36872)

nvd.nist.gov (CVE-2020-36872)

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