Was the vendor behind the flaw named?
No. KDDI and every outlet that covered the breach — Security Affairs, BleepingComputer, and SC Media included — describe the flaw only as "a vulnerability in third-party software," without naming the vendor, the product, or a CVE. Six ISPs' customers still don't know which specific tool actually failed.
Answered in
One Vendor Flaw Just Exposed 14.2 Million Logins Across Six Japanese ISPsA flaw in one unnamed vendor's software let attackers into a shared email platform, exposing up to 14.2 million accounts across six Japanese ISPs.
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