Cisco SD-WAN vEdge Software Buffer Overflow Vulnerabilities

Vulnerability

Cisco SD-WAN vEdge Software, specifically the vContainer and vEdge platforms, is affected by multiple buffer overflow vulnerabilities. The issue resides in improper input validation when handling certain crafted packets or commands. An authenticated, local attacker on the device can trigger the overflow. Affected versions include all releases prior to the fixed versions listed in the Cisco advisory [1].

Exploitation

An attacker must have local access to the device with valid credentials (at least user-level) and be able to execute commands or send crafted input to the affected service. The exploitation sequence involves submitting specially crafted data that exceeds buffer boundaries, leading to memory corruption [1].

Impact

Successful exploitation allows the attacker to execute arbitrary code as the root user or cause a denial of service (DoS) condition. This grants complete control over the affected device, including the ability to modify configurations, intercept traffic, or disrupt network operations [1].

Mitigation

Cisco has released fixed software versions for the affected products. Customers are advised to upgrade to the latest release as per the advisory [1]. There is no workaround other than upgrading. Devices that are end-of-life may not receive updates, and should be replaced. This CVE is not currently listed on the Known Exploited Vulnerabilities (KEV) catalog [1].