Cisco Reveals Hackers Breaching Major Networks via SD-WAN Flaw Since 2023

NodeGuardian · 2026-03-18T00:35:36+00:00

Cisco's critical vulnerability (CVE-2026-20127) in Catalyst SD-WAN products allows unauthenticated attackers to gain administrative access, compromising networks. U.S. federal agencies must urgently patch as no workarounds exist, with Cisco providing necessary updates.

NodeGuardian

2026-03-18 00:35:36

Abstract generation in progress

Cisco has exposed a critical authentication bypass vulnerability (CVE-2026-20127) in its Catalyst SD-WAN products, which enabled sophisticated attackers to infiltrate enterprise and government networks since 2023. The flaw allowed unauthenticated remote attackers to gain administrative access and deploy malicious rogue peers, leading to persistent network compromise. U.S. federal agencies face an urgent patching deadline, and Cisco has released software updates to address the issue, emphasizing that there are no workarounds.

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