TL;DR

Cisco's SD-WAN system is under attack due to a zero-day vulnerability (CVE-2026-20127) that was actively exploited over a three-year period with minimal trace left behind.

What happened

An unknown threat actor has been exploiting a maximum-severity zero-day vulnerability in Cisco's SD-WAN for the past three years, leaving minimal evidence of their activities. The exploit affected multiple versions of the software.

Why it matters for ops

This prolonged exploitation highlights the challenge of detecting and mitigating advanced threats that leave little trace. It underscores the importance of continuous monitoring and proactive security measures.

Action items

  • Update SD-WAN systems to the latest version with security patches
  • Implement enhanced logging and monitoring for anomaly detection
  • Conduct a thorough review of network access controls and segmentation

Source link

https://darkreading.com/vulnerabilities-threats/cisco-sd-wan-zero-day-exploitation-3-years