TLDR Tech / InfoSec
Microsoft Defender Glitch Breaks Secure Systems by Flagging DigiCert Certificates
A faulty Microsoft Defender intelligence update on May 3 wrongly tagged DigiCert root certificates as Trojan:Win32/Cerdigent.A!dha, leading endpoints to quarantine or remove them and breaking certificate-based trust. Users saw TLS sites fail, apps break, and updates stop, while admins initially suspected an active attack. Microsoft pushed corrected definitions and urged rapid Defender updates plus checks for stripped certificates.
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