BSNL suffers second data breach in six months

Bharat Sanchar Nigam Ltd has suffered a data breach, with a threat actor claiming to have accessed sensitive information, including international mobile subscriber identity (IMSI) numbers , SIM card details, home location register data and critical security keys, digital risk management firm Athentian Technology said in a report.

The breach claimed by the threat actor, who goes by the name “kiberphant0m”, involved more than 278 GB of data from BSNL’s telecom operations, including server snapshots, which can be misused for SIM cloning and potentially more severe criminal activities like extortion, Athenian Technology chief executive Kanishk Gaur told ET.