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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| BACnet Interoperability Test Services | BACnet Test Server | ≤ 1.01 | — |
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