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Cisco SD-WAN auth flaw fuels years-long zero-day campaigns, urgent patch urged

1 min read
Source: BleepingComputer
Cisco SD-WAN auth flaw fuels years-long zero-day campaigns, urgent patch urged
Photo: BleepingComputer
TL;DR Summary

Cisco warns of a critical authentication-bypass vulnerability in Catalyst SD-WAN (CVE-2026-20127) that attackers actively exploited since 2023 to log in as a high-privilege user, insert rogue peers, and potentially gain root access. Government advisories (CISA and UK NCSC) issued urgent directives; Cisco released updates but says no workaround fully mitigates the issue. Organizations should harden exposed interfaces, review logs for anomalous peering, and patch promptly.

Topics:business#cisco#cve-2026-20127#cybersecurity#sd-wan#technology#zero-day
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  1. Critical Cisco SD-WAN bug exploited in zero-day attacks since 2023  BleepingComputer
  2. Exploitation of Cisco Catalyst SD-WAN  National Cyber Security Centre
  3. Active exploitation of Cisco Catalyst SD-WAN by UAT-8616  Cisco Talos Blog
  4. CISA gives agencies until Friday to patch critical cyber bug  Federal News Network
  5. Supplemental Direction ED 26-03: Hunt and Hardening Guidance for Cisco SD-WAN Systems  CISA (.gov)

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