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ZeroLogon testing script

A Python script that uses the Impacket library to test vulnerability for the Zerologon exploit (CVE-2020-1472).

It attempts to perform the Netlogon authentication bypass. The script will immediately terminate when successfully performing the bypass, and not perform any Netlogon operations. When a domain controller is patched, the detection script will give up after sending 2000 pairs of RPC calls and conclude the target is not vulnerable (with a false negative chance of 0.04%).


Requires Python 3.7 or higher and Pip. Install dependencies as follows:

pip install -r requirements.txt

Note that running pip install impacket should work as well, as long as the script is not broken by future Impacket versions.

Running the script

The script targets can be used to target a DC or backup DC. It likely also works against a read-only DC, but this has not been tested. Given a domain controller named EXAMPLE-DC with IP address, run the script as follows:


The DC name should be its NetBIOS computer name. If this name is not correct, the script will likely fail with a STATUS_INVALID_COMPUTER_NAME error.

A Whitepaper on this vulnerability will be published here: on Monday 14 sept.

Running via Docker

Instead of running the script locally, you can also run a Docker container as follows:

sudo docker run -it ttervoort/zerologon-tester EXAMPLE-DC