Cisco Issues Alert for SD-WAN Zero-Day Exploited in 2026
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SAN FRANCISCO — Cisco Systems has received additional corroborating reports regarding the active exploitation of the critical zero-day vulnerability in its SD-WAN software. The new intelligence confirms that the command injection and privilege escalation flaw, tracked as CVE-2026-20245, continues to be targeted by threat actors across multiple sectors. Cisco's security team is monitoring the situation closely as the scope of the exploitation appears to be widening. The company is urging all customers running affected versions of the Cisco Catalyst SD-WAN Manager to apply the latest patches immediately. No new technical details regarding the vulnerability's mechanics have been disclosed beyond the initial advisory. The additional reports reinforce the urgency of the situation, prompting Cisco to reiterate its recommendation for immediate remediation to prevent unauthorized access to network infrastructure. Security researchers are advised to report any new instances of exploitation to Cisco's PSIRT team.
SAN FRANCISCO — Cisco Systems issued an urgent advisory on Wednesday warning customers that a critical zero-day vulnerability in its SD-WAN software is being actively exploited in the wild.
The vulnerability, tracked as CVE-2026-20245, affects the command-line interface of the Cisco Catalyst SD-WAN Manager. Cisco confirmed that the flaw allows for command injection and privilege escalation due to insufficient validation of user-supplied input. This marks the seventh SD-WAN zero-day vulnerability exploited in 2026.
The company stated that threat actor UAT-8616 is currently leveraging the vulnerability to target global networks. Cisco advised all customers running affected versions of the SD-WAN Manager to apply patches immediately to mitigate the risk of unauthorized access.
Mandiant, a cybersecurity firm, has also identified the threat actor and the specific exploitation patterns associated with the vulnerability. The firm noted that the attack vector targets the management plane of the SD-WAN infrastructure, potentially allowing attackers to execute arbitrary commands with elevated privileges.
The vulnerability was discovered following reports of suspicious activity on multiple networks. Cisco's security team confirmed that the flaw stems from a coding error that fails to properly sanitize input entered into the command-line interface. This oversight enables attackers to inject malicious commands that the system executes without proper authorization checks.
Cisco has released a patch to address the issue and is urging customers to update their systems as soon as possible. The company also recommended that organizations review their network logs for signs of compromise and implement additional monitoring measures to detect potential intrusions.
The incident highlights the ongoing challenges organizations face in securing their network infrastructure against sophisticated cyber threats. As more companies adopt SD-WAN solutions to manage their network traffic, the risk of such vulnerabilities being exploited increases.
Security experts warn that the active exploitation of this zero-day vulnerability underscores the need for continuous monitoring and rapid response to emerging threats. Organizations are advised to stay vigilant and follow best practices for network security to protect against similar attacks.
The situation remains fluid as cybersecurity firms continue to monitor the threat landscape for new developments related to the vulnerability and the activities of UAT-8616. Further details on the scope of the exploitation and the specific targets affected are expected to emerge in the coming days.