Gerben Kleijn (OSWE, CISSP) is a Managing Security Consultant for Bishop Fox, where he oversees a team of penetration testers. His focus areas include cloud penetration tests, external network penetration tests, and web application assessments as well as cloud deployment reviews for Amazon Web Services (AWS). He has advised Fortune 500 brands and startups in industries such as media, retail, and software in addition to popular websites, credit reporting agencies, and marketing platforms.
From Gerben Kleijn
Blog / Industry
Azure Hacking: New Cloudfoxable Challenges
May 04, 2026
Blog / Culture
Hacking the Norm: Unique Career Journeys into Cybersecurity
Jan 30, 2025
Blog / Technical Research
Using CloudTrail to Pivot to AWS Accounts
Jun 07, 2022
Blog / Advisories
OpenClinic Version 0.8.2 Advisory
Dec 01, 2020
Blog / Technical Research
Well, That Escalated Quickly: Privilege Escalation in AWS
Dec 19, 2019
Blog / Technical Research
Escalator to the Cloud: 5 Privesc Attack Vectors in AWS
Dec 19, 2019
Blog / Technical Research
Glossary of Relevant AWS Terms
Oct 28, 2019
Blog / Technical Research
An Introduction to AWS Cloud Security
Aug 28, 2018
Blog / Technical Research
A Guide to AWS S3 Buckets Security
Jul 10, 2018
Blog / Technical Research
Stand Your Cloud #3: AWS Provisioning and Access Requests
Nov 14, 2017
