Cracking eSIM: Exposing the Hidden Threats in Next-Gen Mobile Security

eSIM technology has transformed the way we connect—but has it also introduced new vulnerabilities into the heart of modern telecommunications?

In this deep-dive episode, we dissect the security architecture, remote provisioning systems, and critical attack surfaces of embedded SIM (eSIM) technology, now deployed in billions of mobile, consumer, and IoT devices worldwide. While eSIMs offer convenience, flexibility, and integration benefits, a growing body of research reveals severe flaws in their design and implementation—flaws that allow profile hijacking, cloning, and even eavesdropping on private communications.

We begin by tracing the evolution of Subscriber Identity Module (SIM) technology into today’s eUICC-based eSIM architecture, reviewing the GSMA’s role in standardizing eSIMs for machine-to-machine (M2M), consumer, and IoT deployments. We unpack the core remote provisioning components, such as SM-SR, SM-DP+, LPA, and IPA, and explain how they interact to enable over-the-air SIM profile installation and switching—technically elegant, but increasingly a security liability.

The heart of the episode delves into high-impact vulnerabilities that continue to shake the telecom industry:

• Memory exhaustion attacks that brick eSIMs by orphaning profile containers
• Malicious profile locking that disables switching to other networks
• Cloning and profile hijacking, demonstrated in 2025 by researchers who extracted private cryptographic keys from real-world GSMA-certified eUICCs
• Undetected Java app injection, allowing rogue code to be embedded in live profiles
• Critical failures in Java Card VM implementations, enabling type confusion and remote profile manipulation

We also discuss the wider systemic implications, including:

• How attackers cloned an Orange eSIM and hijacked a subscriber’s identity undetected
• Why “tamper-proof” certification claims are now under scrutiny
• The limitations of current GSMA security fixes and certification frameworks
• Why hardware security modules (HSMs) and cryptographic audits are essential for true resilience
• The tension between convenience and control in mobile ecosystems—and what’s at stake if security doesn’t catch up with innovation

As vendors scramble to issue patches and strengthen defenses, the telecom industry faces an urgent reckoning: Can eSIM technology remain viable without complete trust in its secure elements? And are operators, vendors, and standard bodies doing enough to prevent the next wave of remote SIM exploitation?

Whether you're a telecom engineer, a cybersecurity professional, or an executive responsible for device security, this episode reveals the high-stakes battle for the security of our mobile identities—and what it will take to protect billions of connected users from invisible compromise.