Carl B. Johnson
Author

Carl B. Johnson

vCISO and compliance expert.

https://carlbjohnson.com

posts

Zero Trust Security Model

Zero Trust Security Model: Why Perimeter Defense Is Dead

In January 2024, Microsoft disclosed that the Russian threat actor Midnight Blizzard had breached corporate email accounts — not by exploiting some exotic zero-day, but by password spraying a legacy test tenant that lacked multi-factor authentication. One overlooked account. No MFA. Catastrophic access. If a company with Microsoft's resources

Carl B. Johnson Jun 12, 2025 7 min read
Zero Trust

What Is Zero Trust? A Practical Guide for 2025

The Breach That Made "Trust But Verify" Obsolete In January 2024, Microsoft disclosed that a Russian state-sponsored threat actor known as Midnight Blizzard had compromised executive email accounts — not by exploiting some exotic zero-day, but by password-spraying a legacy test tenant account that lacked multi-factor authentication. One overlooked

Carl B. Johnson Jun 12, 2025 8 min read
Zero Trust Network Access

Zero Trust Network Access: A Practical 2025 Guide

The VPN That Let Attackers Walk Right In In January 2024, the Cybersecurity and Infrastructure Security Agency (CISA) confirmed that Chinese state-sponsored threat actors had exploited Ivanti Connect Secure VPN vulnerabilities to breach multiple U.S. federal agencies. The attackers didn't kick down the door. They walked through

Carl B. Johnson May 25, 2025 7 min read
Zero Trust Implementation

Zero Trust Implementation: A Practical Guide for 2025

In January 2024, Microsoft disclosed that a Russian threat actor known as Midnight Blizzard breached corporate email accounts — not through some exotic zero-day, but by password-spraying a legacy test account that lacked multi-factor authentication. One forgotten account. No segmentation. No least-privilege enforcement. The result: a nation-state actor reading executive emails

Carl B. Johnson May 25, 2025 7 min read
Work From Home Cybersecurity

Work From Home Cybersecurity: A 2025 Survival Guide

In March 2024, a single remote employee at a midsize financial firm clicked a link in what looked like a Microsoft Teams notification. Within 72 hours, a threat actor had moved laterally across the company's network, exfiltrated 1.2 million customer records, and deployed ransomware that locked every

Carl B. Johnson May 25, 2025 7 min read
VPN Best Practices

VPN Best Practices: 9 Rules That Actually Stop Breaches

In May 2024, Check Point disclosed that threat actors were actively exploiting a zero-day vulnerability in its VPN products — CVE-2024-24919 — to harvest Active Directory credentials and move laterally through enterprise networks. Attackers didn't need a sophisticated exploit chain. They needed one VPN gateway running a default configuration with

Carl B. Johnson May 25, 2025 7 min read
Remote Desktop Security Risks

Remote Desktop Security Risks: What Attackers See

Port 3389: The Door You Left Wide Open In January 2024, the FBI and CISA issued a joint advisory warning that the Phobos ransomware group had been exploiting exposed Remote Desktop Protocol (RDP) services to breach organizations across government, healthcare, education, and critical infrastructure. The attackers didn't use

Carl B. Johnson May 18, 2025 8 min read
Cybersecurity Training Compliance

Cybersecurity Training Compliance: What Regulators Want

In October 2024, the FTC finalized a settlement with Marriott International and its subsidiary Starwood Hotels over data breaches that exposed the personal information of 344 million customers. Among the FTC's requirements: Marriott had to implement a comprehensive information security program — including mandatory employee training. That wasn'

Carl B. Johnson May 10, 2025 7 min read
NIST Cybersecurity Framework

NIST Cybersecurity Framework: A Practical Guide for 2025

The Framework Nobody Reads — Until After the Breach In February 2024, Change Healthcare suffered a ransomware attack that disrupted pharmacy operations across the United States for weeks. UnitedHealth Group eventually disclosed that the breach affected roughly 100 million individuals — making it one of the largest healthcare data breaches in history.

Carl B. Johnson May 10, 2025 7 min read