An important security error in the upper eSIM system could put billions of devices at risk – here is what we know

• A test eSIM profile used by billions of units carried a major error
• It made it possible for malicious actors with physical access the opportunity to implement applets
• A patch is now available so users need to upgrade now

Security researchers have discovered a vulnerability in eSIM technology used in virtually all smartphones and many other internet-connected, smart devices.

In theory, the error could have been abused to intercept or manipulate communication, extract sensitive data, inject malicious applets and more.