Cisco SD-WAN Buffer Overflow Vulnerabilities

Vulnerability

Cisco SD-WAN products are affected by multiple buffer overflow vulnerabilities (CVE-2021-1301). These vulnerabilities exist in the software's handling of specific inputs, allowing an attacker to trigger a buffer overflow condition. The affected products include various Cisco SD-WAN devices and software versions prior to the fixed releases indicated in the Cisco advisory [1].

Exploitation

An unauthenticated, remote attacker can exploit these vulnerabilities by sending specially crafted network requests to an affected device. No authentication or user interaction is required. The attacker can trigger the buffer overflow by providing input that exceeds the expected size, leading to memory corruption [1].

Impact

Successful exploitation could allow the attacker to execute arbitrary code on the affected device with elevated privileges. This could lead to full compromise of the device, including the ability to install malware, modify configurations, or disrupt network operations [1].

Mitigation

Cisco has released free software updates to address these vulnerabilities. Customers are advised to upgrade to the latest fixed version as specified in the Cisco Security Advisory [1]. No workarounds are available. Customers should consult the advisory for the specific fixed release versions and upgrade instructions.