SK Telecom USIM Data Compromise: Millions of Customers at Risk

SK Telecom, South Korea's largest telecom provider, experienced a malware attack on April 19, 2025, which compromised customer Universal Subscriber Identity Module (USIM) data, leading to concerns over potential misuse such as SIM-swapping and surveillance. The breach prompted SK Telecom to notify authorities, enhance security measures, and offer free USIM protection services to its 34 million subscribers. In response, the company has implemented stricter protocols and paused new subscriber sign-ups to focus on replacing affected SIM cards, providing free replacements to 24.2 million customers, though this has led to shortages. SK Group chair Chey Tae-won publicly apologized for the incident, and the company is cooperating with investigations while planning to bolster security across its operations, including establishing an Information Protection Innovation committee. For enterprises seeking to improve user authentication, solutions like SSOJet offer tools such as multi-factor authentication and secure single sign-on to safeguard digital assets.

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