AmpFuzz: Fuzzing for Amplification DDoS Vulnerabilities


Johannes Krupp, CISPA Helmholtz Center for Information Security; Ilya Grishchenko, University of California, Santa Barbara; Christian Rossow, CISPA Helmholtz Center for Information Security


Amplification DDoS attacks remain a prevalent and serious threat to the Internet, with recent attacks reaching the Tbps range. However, all amplification attack vectors known to date were either found by researchers through laborious manual analysis or could only be identified postmortem following large attacks. Ideally though, an attack vector is discovered and mitigated before the first attack can occur.

To this end, we present AmpFuzz, the first systematic approach to find amplification vectors in UDP services in a protocol-agnostic way. AmpFuzz is based on the state-of-the-art greybox fuzzing boosted by a novel technique to make fuzzing UDP-aware, which significantly increases performance. We evaluate AmpFuzz on 28 Debian network services, where we (re-)discover 7 known and 6 previously unreported amplification vulnerabilities.

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@inproceedings {281376,
author = {Johannes Krupp and Ilya Grishchenko and Christian Rossow},
title = {{AmpFuzz}: Fuzzing for Amplification {DDoS} Vulnerabilities},
booktitle = {31st USENIX Security Symposium (USENIX Security 22)},
year = {2022},
isbn = {978-1-939133-31-1},
address = {Boston, MA},
pages = {1043--1060},
url = {},
publisher = {USENIX Association},
month = aug,

Presentation Video