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Cisco Secure Email Gateway zero-day patched, RCE exploited in the wild

2026-10-15 15:35 UTC · BleepingComputer · read the source ↗ #cisco#zero-day#rce
  • Engineer — Act: Unauthenticated root RCE on a perimeter email appliance under active exploitation demands emergency patching outside normal windows; upgrade Cisco SEG to the fixed release immediately and audit appliance integrity post-patch.
  • SOC/IR — Act: Active exploitation of a perimeter device warrants an assume-breach sweep: review Cisco SEG logs for anomalous process execution, unexpected admin accounts, or unusual outbound connections since before the patch advisory date.
  • Leader — Act: Confirm this week whether the organization runs Cisco SEG and verify that engineering has initiated emergency patching; an actively exploited unauthenticated RCE on the email gateway is a plausible breach vector requiring same-week tracking.
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