Cisco SD-WAN Buffer Overflow Vulnerabilities

Vulnerability

CVE-2021-1300 is a buffer overflow vulnerability affecting Cisco SD-WAN products. The vulnerability exists in the software handling of certain inputs, allowing an unauthenticated, remote attacker to trigger a buffer overflow. Affected versions include Cisco SD-WAN vManage, vSmart, vBond, and vEdge devices running specific software releases. For exact version details, refer to the Cisco advisory [1].

Exploitation

An attacker can exploit this vulnerability by sending specially crafted network traffic to an affected device. No authentication is required, and the attack can be launched remotely over the network. The attacker does not need prior access or user interaction.

Impact

Successful exploitation could allow the attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on the affected device. This could lead to full compromise of the device and potential disruption of SD-WAN operations.

Mitigation

Cisco has released free software updates to address this vulnerability. Customers are advised to upgrade to the fixed software versions as specified in the Cisco Security Advisory [1]. No workarounds are available. Customers should consult the advisory for the specific fixed releases.