{"id":"CVE-2020-36872","aliases":["EUVD-2020-30820","GHSA-3v4j-cjvq-5p59"],"status":"published","title":"BACnet Test Server 1.01 Malformed BVLC Length DoS","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.","severity":{"version":"4.0","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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00533,"percentile":0.45503,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2025-11-26T22:13:47Z","modified":"2026-07-28T01:47:03Z","products":[{"vendor":"bacnet interoperability test services, inc.","product":"bacnet test server"}],"references":[{"url":"https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php","tags":["technical-description","exploit"]},{"url":"https://www.exploit-db.com/exploits/48860","tags":["exploit"]},{"url":"https://packetstormsecurity.com/files/159504","tags":["exploit"]},{"url":"https://cxsecurity.com/issue/WLB-2020100045","tags":["exploit"]},{"url":"https://www.bac-test.com/","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36872"},{"url":"https://www.bac-test.com"},{"url":"https://github.com/advisories/GHSA-3v4j-cjvq-5p59"}],"sources":{"cve":[{"id":"CVE-2020-36872","title":"BACnet Test Server 1.01 Malformed BVLC Length DoS","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.","status":"published","published":"2025-11-26T22:13:47.565Z","modified":"2026-07-28T01:47:03.79Z","cvss":[{"version":"4.0","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","level":"high","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:55.128961Z"}],"euvd":[{"id":"EUVD-2020-30820","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.","status":"published","published":"2025-11-26T22:13:47Z","modified":"2026-07-28T01:47:03Z","cvss":[{"version":"4.0","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","level":"high"}],"updated_at":"2026-11-02T18:02:32.984181Z"}],"ghsa":[{"id":"GHSA-3v4j-cjvq-5p59","title":"BACnet Test Server versions up to and including 1.01 contains a remote denial of service...","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.","status":"published","published":"2025-11-27T00:30:27Z","modified":"2025-11-27T00:30:27Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T15:04:58.596385Z"}],"nvd":[{"id":"CVE-2020-36872","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.","status":"published","published":"2025-11-26T23:15:47.227Z","modified":"2026-06-17T03:16:23.22Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:48.591569Z"}]}}