DeeperML

Japanese telecom giant NTT Communications has confirmed a data breach impacting nearly 18,000 corporate customers. The company discovered unauthorized access to its internal systems on February 5, 2025. Hackers are reported to have accessed details of these organizations, potentially compromising sensitive data.

The stolen data includes customer names, contract numbers, phone numbers, email addresses, physical addresses, and information on service usage belonging to 17,891 organizations, according to NTT Com. While NTT Com has restricted access to compromised devices and disconnected another compromised device, the specific nature of the cyberattack and the identity of the perpetrators remain unknown. It’s not yet known how many individuals had personal data stolen.

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References :

• Carly Page: Japanese telecom giant NTT Communications says hackers stole the data of almost 18,000 corporate customers during a February cyberattack. It’s not yet known how many individuals had personal data stolen or who was behind the NTT breach
• CyberInsider: NTT Communications Suffers Data Breach Impacting 18,000 Companies
• BleepingComputer: Japanese telecommunication services provider NTT Communications Corporation (NTT) is warning almost 18,000 corporate customers that their information was compromised during a cybersecurity incident.
• techcrunch.com: Unidentified hackers breached NTT Com’s network to steal personal information of employees at thousands of corporate customers
• bsky.app: Japanese telecommunication services provider NTT Communications Corporation (NTT) is warning almost 18,000 corporate customers that their information was compromised during a cybersecurity incident.
• The DefendOps Diaries: Lessons from the NTT Data Breach: A 2025 Perspective
• bsky.app: Japanese telecommunication services provider NTT Communications Corporation (NTT) is warning almost 18,000 corporate customers that their information was compromised during a cybersecurity incident.
• www.scworld.com: NTT Communications says hackers stole the data of almost 18,000 corporate customers during a February cyberattack
• securityaffairs.com: Japanese telecom giant NTT suffered a data breach that impacted 18,000 companies
• The420.in: Japanese Telecom Giant NTT Suffers Data Breach, Impacting 18,000 Companies
• www.it-daily.net: The Japanese ICT provider NTT Communications (NTT Com) has admitted to a serious security breach that resulted in the loss of information on a total of 17,891 corporate customers.
• www.scworld.com: Nearly 18K orgs' data compromised in NTT Communications hack

Classification:

• HashTags: #DataBreach #Cyberattack #NTT
• Company: NTT Communications
• Target: NTT Communications Customers
• Product: Network
• Feature: Data theft
• Type: DataBreach
• Severity: Major