CVE-2018-0151criticalunder attackCWE-119

CVE-2018-0151: critical vulnerability in Cisco IOS and IOS XE

Published · Updated

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63Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 9.8epss 14%
from disclosure to weapon
Published on NVDMar 28
CISA KEV+1436d
Action required by CISAfederal deadline: 2022-03-17

Apply updates per vendor instructions.

In short

A flaw in Cisco IOS and IOS XE's quality of service system allows an unauthenticated attacker to send specially crafted packets to port 18999 that can crash the device or run malicious code with high privileges. This matters because an exposed device can be completely compromised or disabled without any authentication.

Technical detail

A buffer overflow vulnerability exists in the QoS subsystem of Cisco IOS and IOS XE due to improper bounds checking of UDP port 18999 traffic. An unauthenticated remote attacker can send malicious packets destined to the affected device to trigger the overflow, potentially achieving arbitrary code execution with elevated privileges or denial of service via device reload; traffic merely transiting the device does not trigger the vulnerability.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges. The vulnerability is due to incorrect bounds checking of certain values in packets that are destined for UDP port 18999 of an affected device. An attacker could exploit this vulnerability by sending malicious packets to an affected device. When the packets are processed, an exploitable buffer overflow condition may occur. A successful exploit could allow the attacker to execute arbitrary code on the affected device with elevated privileges. The attacker could also leverage this vulnerability to cause the device to reload, causing a temporary DoS condition while the device is reloading. The malicious packets must be destined to and processed by an affected device. Traffic transiting a device will not trigger the vulnerability. Cisco Bug IDs: CSCvf73881.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
n/a · Cisco IOS and IOS XE