CyberX9's multiple critical security vulnerabilities "exposed customer's sensitive and confidential personal data including call logs of nearly 301 million (30.1 crores) customers to the whole internet"
Livemint reports that Vi acknowledged a flaw in its billing communication system, though it fixed the issue "immediately".
The report adds that Vi conducted a "thorough forensic analysis", which revealed there "was no data breach".
In its defence, the telco said that it performs "regular checks" and audits are conducted to strengthen the security infrastructure.