description: A vulnerability in the Layer 2 Tunneling Protocol (L2TP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper handling of certain L2TP packets. An attacker could exploit this vulnerability by sending crafted L2TP packets to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.
Note: Only traffic directed to the affected system can be used to exploit this vulnerability.
problem types: Error Handling
affected:
{
vendor: Cisco
product: Cisco IOS XE Software
versions:
version: 16.8.1, status: affected
version: 16.8.1a, status: affected
version: 16.8.1b, status: affected
version: 16.8.1s, status: affected
version: 16.8.1c, status: affected
version: 16.8.1d, status: affected
version: 16.8.2, status: affected
version: 16.8.1e, status: affected
version: 16.8.3, status: affected
version: 16.9.1, status: affected
version: 16.9.2, status: affected
version: 16.9.1a, status: affected
version: 16.9.1b, status: affected
version: 16.9.1s, status: affected
version: 16.9.3, status: affected
version: 16.9.4, status: affected
version: 16.9.5, status: affected
version: 16.9.5f, status: affected
version: 16.9.6, status: affected
version: 16.9.7, status: affected
version: 16.9.8, status: affected
version: 16.10.1, status: affected
version: 16.10.1a, status: affected
version: 16.10.1b, status: affected
version: 16.10.1s, status: affected
version: 16.10.1c, status: affected
version: 16.10.1e, status: affected
version: 16.10.1d, status: affected
version: 16.10.2, status: affected
version: 16.10.1f, status: affected
version: 16.10.1g, status: affected
version: 16.10.3, status: affected
version: 16.11.1, status: affected
version: 16.11.1a, status: affected
version: 16.11.1b, status: affected
version: 16.11.2, status: affected
version: 16.11.1s, status: affected
version: 16.12.1, status: affected
version: 16.12.1s, status: affected
version: 16.12.1a, status: affected
version: 16.12.1c, status: affected
version: 16.12.1w, status: affected
version: 16.12.2, status: affected
version: 16.12.1y, status: affected
version: 16.12.2a, status: affected
version: 16.12.3, status: affected
version: 16.12.8, status: affected
version: 16.12.2s, status: affected
version: 16.12.1x, status: affected
version: 16.12.1t, status: affected
version: 16.12.4, status: affected
version: 16.12.3s, status: affected
version: 16.12.4a, status: affected
version: 16.12.5, status: affected
version: 16.12.6, status: affected
version: 16.12.1z1, status: affected
version: 16.12.5a, status: affected
version: 16.12.1z2, status: affected
version: 16.12.6a, status: affected
version: 16.12.7, status: affected
version: 16.12.10a, status: affected
version: 17.1.1, status: affected
version: 17.1.1a, status: affected
version: 17.1.1s, status: affected
version: 17.1.1t, status: affected
version: 17.1.3, status: affected
version: 17.2.1, status: affected
version: 17.2.1r, status: affected
version: 17.2.1a, status: affected
version: 17.2.1v, status: affected
version: 17.2.2, status: affected
version: 17.2.3, status: affected
version: 17.3.1, status: affected
version: 17.3.2, status: affected
version: 17.3.3, status: affected
version: 17.3.1a, status: affected
version: 17.3.1w, status: affected
version: 17.3.2a, status: affected
version: 17.3.1x, status: affected
version: 17.3.1z, status: affected
version: 17.3.4, status: affected
version: 17.3.5, status: affected
version: 17.3.4a, status: affected
version: 17.3.6, status: affected
version: 17.3.4c, status: affected
version: 17.3.5a, status: affected
version: 17.3.5b, status: affected
version: 17.3.7, status: affected
version: 17.4.1, status: affected
version: 17.4.2, status: affected
version: 17.4.1a, status: affected
version: 17.4.1b, status: affected
version: 17.4.2a, status: affected
version: 17.5.1, status: affected
version: 17.5.1a, status: affected
version: 17.5.1b, status: affected
version: 17.5.1c, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
baseScore: 8.6
baseSeverity: HIGH
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
]
exploits: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.