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Cisco Network Convergence System 5500 Series Routers Local Denial of Service Vulnerability

Information

Severity

Severity

Low

Family

Family

CISCO

CVSSv2 Base

CVSSv2 Base

1.9

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:M/Au:N/C:N/I:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

5 years ago

Modified

Modified

3 years ago

Summary

A vulnerability in the forwarding component of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers could allow an authenticated, local attacker to cause the router to stop forwarding data traffic across Traffic Engineering (TE) tunnels, resulting in a denial of service (DoS) condition.

Insight

Insight

The vulnerability occurs because adjacency information for a Traffic Engineering (TE) tunnel's physical source interface is not propagated to hardware after the adjacency is lost. This information needs to be relearned. An attacker could exploit this vulnerability by logging in to the router's CLI with administrator privileges and issuing the clear arp-cache command.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

See the referenced vendor advisory for a solution.

Common Vulnerabilities and Exposures (CVE)