The Equifax Breach | One of the Largest Data Exposures in History

🎙 With Jeremy Ladner and guest co-hosts Kavitha Mariappan and Mark Dorsi

For months, the warning was sitting in plain sight.

A critical vulnerability.

Publicly disclosed.

Actively exploited.

A patch was available.

Inside one of the largest credit reporting agencies in the world, the system remained exposed.

No zero-day.

No advanced exploit chain.

Just a missed update.

In May 2017, attackers began exploiting a known flaw in the Apache Struts framework.

The vulnerability allowed remote code execution.

Unauthenticated.

Unrestricted.

From the outside, it looked like routine traffic.

Inside the network, it was something else.

They accessed databases.

Queried records.

And began extracting one of the most sensitive datasets imaginable.

Names.

Social Security numbers.

Birth dates.

Addresses.

The identity layer of nearly half the United States population.

For 76 days, the activity continued.

No alarms.

No interruption.

Until it was too late.

By the time Equifax disclosed the breach in September 2017, approximately 147 million individuals had been affected.

Executives resigned.

Investigations launched.

Congress intervened.

But the breach itself had already unfolded.

Because this was not a story about attackers breaking through hardened defenses. It was a story about what happens when a known vulnerability remains unpatched inside a system that holds national-scale data.

In this episode of The CISO Signal | True Cybercrime Podcast, host Jeremy Ladner is joined by Kavitha Mariappan of Rubrik and Mark Dorsi, CISO at Netlify, to examine how a single missed control can cascade into systemic failure, why patch management must be operationalized not assumed, and what resilience actually means when prevention fails.

Because in cybersecurity, the most dangerous vulnerabilities are often the ones already documented. And already waiting.

🎙 Guest CISO Co-Host

Mark Dorsi

Chief Information Security Officer

Netlify

https://www.netlify.com

🤝 Sponsor Expert

Kavitha Mariappan

Chief Transformation Officer, Rubrik

https://www.rubrik.com

Rubrik delivers cyber resilience by securing data across enterprise, cloud, and SaaS environments, enabling organizations to recover quickly from cyber incidents and maintain operational continuity.

🔎 Episode Topics

• The Apache Struts vulnerability (CVE-2017-5638) and how it was exploited

• Why patch management failures still drive catastrophic breaches

• How attackers operated undetected inside Equifax systems for over two months

• The difference between prevention failure and resilience failure

• What security leaders must operationalize to avoid systemic exposure

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The AT&T Beijing Breach | Metadata Maps That Intelligence Services Want

With guest co-host John Carse, Field CISO at SquareX

In 2024, attackers did not steal call recordings.
They did not intercept encrypted text messages.
They went after something quieter.
Call detail records.
The outlines of conversations.
Phone numbers.
Timestamps.
Durations.
Cell tower connections.
Metadata that, on its own, seems technical. Harmless. Operational.
But at telecom scale, metadata becomes something else.
Between April and early June 2024, attackers accessed systems containing call and text metadata tied to approximately 86 million AT&T customers. The intrusion was traced to a third-party cloud environment associated with AT&T’s data operations. Investigators later pointed to compromised credentials discovered in a Snowflake environment after a phishing attack and infostealer infection inside a vendor ecosystem.
No ransomware encryption.
No service outage.
No dramatic system shutdown.
Instead, approximately $370,000 in cryptocurrency was reportedly paid in an effort to prevent public exposure of the dataset.
Some analysts linked the activity to a cluster labeled UNC5537.

Other reporting mentioned data brokerage ecosystems such as ShinyHunters. Researchers, including those at Mandiant, urged caution on attribution, noting behavior consistent with criminal monetization rather than confirmed state-sponsored espionage.

There is no public evidence that this dataset was used for intelligence operations.
There is also no way to prove that it was not.

Because telecom metadata does not just describe calls.
It describes relationships.
Who speaks to whom.
How often.
From where.
Which towers were touched along the way.

For criminals, that information enables SIM swapping, fraud, and targeted phishing.
For nation states, it can illuminate social graphs, travel patterns, and networks of influence.

In this episode of The CISO Signal | True Cybercrime Podcast, we examine how third-party access became the breach path, why metadata is often more strategically valuable than content, and what happens when operational data quietly becomes intelligence-grade material.
This is not a story about encryption failing.
It is a story about accumulation.

🎙 Guest Co-Host
John Carse
Field CISO, SquareX
Three-time CISO and host of Be Fearless: The CISO Perspective

🔍 Episode Topics
• What telecom metadata actually reveals beyond call content
• Why large telecom providers are high-value intelligence targets
• How third-party access and credential reuse created the breach path
• Snowflake, vendor risk, and the anatomy of cloud miscalculation
• The criminal data brokerage ecosystem and resale supply chains
• Why metadata can be more operationally useful than call recordings
• Inside the first 24 hours of executive response and board escalation
• How security debt surfaces after a third-party breach
• Why threat models must evolve when operational systems become intelligence repositories

🧊 The Aftershock
On July 12, 2024, AT&T publicly acknowledged the breach, confirming that call and text content were not accessed.
But the exposure shifted the conversation.
Privacy experts noted that metadata can reveal business relationships, political activity, religious observance, romantic connections, and movement patterns, without ever recording a single word.
Later reporting connected the broader Snowflake-related campaign to individuals including John Erin Binns and Connor Moucka, though attribution questions remain complex and evolving.
What makes the AT&T breach different is not technical spectacle.
It is the quiet reality that behavioral data, once accumulated at scale, becomes strategic.
Every organization that logs user behavior now holds a map.
And every map attracts attention.

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