NTT Docomo Details

    Organization Logo

    NTT Docomo

    Tokyo, Japan • 28000 employees • Telecommunications

    https://www.docomo.ne.jp
    United States

    Industry

    Telecommunications

    Security Incidents

    1

    NTT Docomo, Inc. is a leading Japanese telecommunications company that primarily offers mobile phone services. Established in August 1991 as a subsidiary of Nippon Telegraph and Telephone (NTT), it has grown to become the largest mobile phone operator in Japan. NTT Docomo has pioneered numerous advancements in mobile technology, including the introduction of 3G and 4G LTE networks in Japan, and it continues to innovate in the areas of IoT (Internet of Things) and 5G technology.

    Noteworthy among NTT Docomo's services are its innovative mobile applications, payment platforms, and advanced commu...
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    Security Incidents

    NTT Docomo Breach of Mar 2023
    Severity Score
    Moderate to Significant

    Type

    Ransomware Attack

    Summary

    On July 21, 2023, NTT Docomo disclosed that a former temporary employee of its contractor, NTT Nexia, illegally accessed and stole 5.96 million records of user information, including names, addresses, phone numbers, dates of birth, and emails. Notably, the compromised data did not include financial information such as credit card numbers or passwords. The individual responsible was arrested on suspicion of violating the Unauthorized Computer Access Law. In response, NTT Docomo has publicly apologized, set up a hotline for affected users, and promised to strengthen its security protocols, inclu...
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    Severity

    This incident involved a former contractor's employee illegally obtaining 5.96 million pieces of user data from NTT Docomo, including sensitive information like names, addresses, and dates of birth. While no financial data or passwords were compromised, the scale of the breach and the history of similar incidents at the company signal a significant lapse in data security protocols. Given the potential for substantial misuse of personal information, the incident's severity is rated as "Moderate to Significant" (6 on a scale of 10).

    Impact

    The recent cybersecurity incident at NTT Docomo was a data breach involving the illegal acquisition of 5.96 million pieces of user information by a former temporary employee of the contractor, NTT Nexia. The exposed data included personally identifiable information such as names, addresses, phone numbers, dates of birth, and email addresses; however, critical financial information like credit cards and passwords were not compromised. Although NTT Docomo did not report any systems or services being taken offline, the internal pilfering of this data underscores severe vulnerabilities in their da...
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