# 0vercl0k/wtf

wtf is a distributed, code-coverage guided, customizable, cross-platform snapshot-based fuzzer designed for attacking user and / or kernel-mode targets running on Microsoft Windows and Linux user-mode (experimental!).

Repository: https://github.com/0vercl0k/wtf
Canonical: https://ross.abutalabs.com/products/0vercl0k-wtf
Language: C++
License: MIT
License Family: permissive
Topics: fuzzer, snapshot-fuzzer, kvm-api, code-coverage, winhv, bochscpu, bochs, security, fuzzing, testing, fuzz-testing
Last push: 2026-08-26T02:58:51+00:00

## Health v2 (maintenance only)
Score: 74/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 28, longevity 100
- inputs: {"age_days": 1880, "days_push": 7, "days_rel": 550, "gap_med": 37, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1793, forks 154 (observed 2026-08-28T04:05:37.249817+00:00)

## What it is
wtf (what the fuzz) is a distributed, code-coverage guided, snapshot-based fuzzer for attacking user- and kernel-mode targets on Windows and Linux (experimental). It executes targets via the Bochs emulator, Windows Hypervisor Platform APIs, or KVM for speed.

## Use cases
- fuzz a Windows kernel driver from a snapshot
- fuzz a file parser like IDA Pro or a game protocol
- find memory corruption bugs in closed-source binaries
- fuzz user-mode targets on Linux using KVM
- replay and fuzz a VM snapshot taken at an interesting code point

## When to choose
- you have a VM snapshot of a Windows user- or kernel-mode target you want to fuzz
- you need coverage-guided fuzzing of closed-source binaries without source instrumentation
- you want fast execution via hypervisor/KVM or precise execution via Bochs

## When to avoid
- you need to fuzz source-code projects where libFuzzer/AFL++ are simpler
- you need macOS or other non-Windows/non-Linux kernel targets
- you want a managed fuzzing service with a UI rather than a CLI tool

## Facets
- artifact type: cli-tool
- maturity: active
- function: fuzzing, security, benchmarking
- domain: security, penetration-testing, reverse-engineering, developer-tools
- platform: windows, cpp
- tags: snapshot-fuzzer, code-coverage-guided, bochs, hypervisor, kvm, kernel-fuzzing, distributed-fuzzing, linux

## Member repositories
- 0vercl0k/wtf (main) score 74

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:37.249817+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:22:55.638968+00:00, confidence not recorded.
  - readme: https://github.com/0vercl0k/wtf (fetched 2026-08-28T04:05:37.249817+00:00, sha 1a40692721c8)
- Data as of 2026-08-30T08:39:29.467469+00:00.