Medium · published September 28, 2017
CVSS calls it medium at 6.5. It is confirmed in active exploitation. It sits in the 81.9th percentile for exploit probability.
⚠️ A crafted Ethernet frame is all it takes to knock a Cisco ISR G2 router offline! 📡 Think of it like a delivery driver who misreads an address and causes a traffic jam — that simple mistake brings everything to a standstill. In this case, the router reloads, leaving users hanging. If an attacker successfully exploits this vulnerability, they can trigger a denial of service (DoS) condition, causing the router to reload unexpectedly. This could disrupt network services, interrupt communications, and leave you scrambling to restore connectivity.
Think of it like a delivery driver who misreads an address and causes a traffic jam — that simple mistake brings everything to a standstill. In this case, the router reloads, leaving users hanging. This vulnerability arises from a misclassification of Ethernet frames in Cisco IOS versions 15.0 to 15.6, allowing an unauthenticated, adjacent attacker to send a specially crafted frame that causes the device to reload.
If an attacker successfully exploits this vulnerability, they can trigger a denial of service (DoS) condition, causing the router to reload unexpectedly. This could disrupt network services, interrupt communications, and leave you scrambling to restore connectivity. To mitigate this issue, ensure you upgrade Cisco IOS to a fixed version beyond 15.6. Additionally, consider implementing network segmentation to limit adjacent access and enhance security protocols. You've got this! Follow these steps and you'll keep your network running smoothly. 🛡️