NSFOCUS Monthly APT Insights – September 2025

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

APT Groups BITTER and ArcaneDoor Target Enterprises with Cyber Attacks In November 2025, the Indian APT group BITTER launched a cyber attack targeting enterprises and carriers. Earlier, in September 2025, the APT group ArcaneDoor exploited a zero-day vulnerability in the Cisco Adaptive Firewall to conduct attacks, highlighting ongoing threats from advanced persistent threats (APTs). 2 sources 35