Find tomorrow’s vulnerabilities today!
NEWS
SERVICES
We help you handle vulnerabilities in products you use or develop. Beyond identifying individual vulnerabilities, X41 shows you how to improve your products and infrastructure in design and make it resilient even against future threats.
We take care of vendor contacts and work out the technical details with security researchers and developers to do vulnerability reporting.
Our process for finding vulnerabilities and getting them fixed is based on years of experience in uncovering vulnerabilities.
PARTNERS
CUSTOMERS
Public Audits
Some of our customers love transparency and publish the results of security audits together with X41. This helps them to show that they actually care about security and aim to improve the robustness of their software and lets the user base of these applications verify that security is not just an empty claim.
2024
Source Code Audit of Backstage
Source Code Audit of Mullvad VPN
Source Code Audit of BIND9 for ISC
2023
Source Code Audit of libjpeg-turbo for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of Go TUF for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of in-toto for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of c-ares for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of libcap for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of simplejson for the Open Source Technology Improvement Fund (OSTIF)
2022
Source Code Audit of Git for the Open Source Technology Improvement Fund (OSTIF)
Source Code Audit of The Update Framework for the Open Source Technology Improvement Fund (OSTIF)
Penetration Test on Backstage for the Backstage team
2021
Source Code Review of Selected Options Vault Contracts for Thetanuts.Finance
2019
Unbound DNS Server
Monero RandomX
2018
Mozilla Balrog
theQRL
Wire Secure Messenger (Android)
Wire Secure Messenger (Web - Calling)
Wire Secure Messenger (iOS)
2017
Wire Secure Messenger (Proteus)
Whitepaper
Custom security research and analysis of attack surface and technical mitigations enables our customers to go beyond the constant cycle of finding security issues in their software or infrastructure.
One such example is the Browser Whitepaper that X41 created for Google. X41 covers the differences in security design, implementation and user interface of the Google Chrome, Microsoft Edge and Internet Explorer browsers.