InfoSecBulletin Cybersecurity for mankind
A public POC exploit for CVE-2026-20127, a critical zero-day vulnerability in Cisco Catalyst SD-WAN Controller and Manager, has been released. This vulnerability has been actively exploited since 2023.
Cisco Talos is tracking the threat activity under the cluster UAT-8616, describing it as a “highly sophisticated cyber threat actor” targeting critical infrastructure globally.
Anthropic prepares “Claude Money” to analyze bank account and financial data
GhostCode Phishing Kit Evades Microsoft 365 MFA to Hijack Accounts in 78 Seconds
CISA Warns of Cisco Secure Email Gateway 0-Day Flaw Actively Exploited in Attacks
VPN flaw exposed 246,000 personnel records in japan
Hackers deploy Casbaneiro Trojan that activates on bank websites
German police read Signal, Telegram, WhatsApp messages without breaking encryption
Urgent Patch! cPanel, GitLab Flaws Expose Users to RCE, File and Credential Theft
Palo Alto PAN-OS Flaw Enables Root Arbitrary Code Execution
Critical Check Point VPN flaws allow remote code execution attacks
Cisco confirms CVE-2026-20079 flaw in Secure FMC is exploited in attacks
A PoC by zerozenxlabs on GitHub features a Python exploit script and a JSP webshell (cmd.jsp). An unauthenticated remote attacker can send a specific HTTP request to the SD-WAN Controller’s REST API, skipping the login and gaining an admin session without valid credentials.
Once inside, UAT-8616 followed a multi-stage attack chain:
Initial access: Used a known vulnerability to gain high-level admin access and added a fake device to the SD-WAN management system.
Privilege escalation: Rolled back software to an older version with a known flaw
Version restoration: Returned the system to the original software version to remove traces of the downgrade.
Persistence: Added unauthorized SSH keys to /home/root/.ssh/authorized_keys, set PermitRootLogin yes in sshd_config, and modified SD-WAN startup scripts.
Lateral movement: Used network protocols to move between SD-WAN appliances and manipulate the entire fabric configuration
Cover-up: Cleared syslog, bash_history, wtmp, lastlog, and logs under /var/log/.
Cisco Talos urges administrators to immediately audit control connection peering events in SD-WAN logs for unauthorized vManage peer connections, unexpected source IPs, and anomalous timestamps.
CISA has included CVE-2026-20127 in its KEV catalog and requires federal agencies to patch it urgently.
Organizations using Cisco Catalyst SD-WAN must patch immediately, review the security advisory, and follow the Australian Cyber Security Centre’s SD-WAN Threat Hunting Guide to check for any compromises.
