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.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
High
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
Affected products
References
- MISChttps://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5597.php
- EXPLOIThttps://www.exploit-db.com/exploits/48860
- EXPLOIThttps://packetstormsecurity.com/files/159504
- MISChttps://cxsecurity.com/issue/WLB-2020100045
- MISChttps://www.bac-test.com/
- VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/bacnet-test-server-malformed-bvlc-length-dos