Denial of service in Network Convergence System 5500 Series - CVE-2017-6666
Published: June 8, 2017
Vulnerability identifier: #VU6987
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2017-6666
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Network Convergence System 5500 Series
Network Convergence System 5500 Series
Detailed vulnerability description
The vulnerability allows local authenticated attacker to cause DoS condition on the target system.
The weakness exists in the forwarding component of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers due to adjacency information for a Traffic Engineering (TE) tunnel's physical source interface is not propagated to hardware after the adjacency is lost. A local attacker can log in to the router's CLI with administrator privileges, issue the clear arp-cache command and cause the router to stop forwarding data traffic across Traffic Engineering (TE) tunnels.
Successful exploitation of the vulnerability results in denial of service.
The weakness exists in the forwarding component of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers due to adjacency information for a Traffic Engineering (TE) tunnel's physical source interface is not propagated to hardware after the adjacency is lost. A local attacker can log in to the router's CLI with administrator privileges, issue the clear arp-cache command and cause the router to stop forwarding data traffic across Traffic Engineering (TE) tunnels.
Successful exploitation of the vulnerability results in denial of service.
How to mitigate CVE-2017-6666
Install update from vendor's website.