Vulnerability Description
A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a denial of service (DoS) condition, or potentially corrupt the BGP routing table, which could result in network instability. The vulnerability exists due to changes in the implementation of the BGP MPLS-Based Ethernet VPN RFC (RFC 7432) draft between IOS XE software releases. When the BGP Inclusive Multicast Ethernet Tag Route or BGP EVPN MAC/IP Advertisement Route update packet is received, it could be possible that the IP address length field is miscalculated. An attacker could exploit this vulnerability by sending a crafted BGP packet to an affected device after the BGP session was established. An exploit could allow the attacker to cause the affected device to reload or corrupt the BGP routing table; either outcome would result in a DoS. The vulnerability may be triggered when the router receives a crafted BGP message from a peer on an existing BGP session. This vulnerability affects all releases of Cisco IOS XE Software prior to software release 16.3 that support BGP EVPN configurations. If the device is not configured for EVPN, it is not vulnerable. Cisco Bug IDs: CSCui67191, CSCvg52875.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ios | 15.4\(1\)s |
| Cisco | Ios Xe | < 16.3 |
| Cisco | 1000 Integrated Services Router | - |
| Cisco | 1100-4G\/6G Integrated Services Router | - |
| Cisco | 1100-4G Integrated Services Router | - |
| Cisco | 1100-4Gltegb Integrated Services Router | - |
| Cisco | 1100-4Gltena Integrated Services Router | - |
| Cisco | 1100-4P Integrated Services Router | - |
| Cisco | 1100-6G Integrated Services Router | - |
| Cisco | 1100-8P Integrated Services Router | - |
| Cisco | 1100-Lte Integrated Services Router | - |
| Cisco | 1100 Integrated Services Router | - |
| Cisco | 1101-4P Integrated Services Router | - |
| Cisco | 1101 Integrated Services Router | - |
| Cisco | 1109-2P Integrated Services Router | - |
| Cisco | 1109-4P Integrated Services Router | - |
| Cisco | 1109 Integrated Services Router | - |
| Cisco | 1111X-8P Integrated Services Router | - |
| Cisco | 1111X Integrated Services Router | - |
| Cisco | 111X Integrated Services Router | - |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/101676Broken LinkThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- http://www.securityfocus.com/bid/101676Broken LinkThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-US Government Resource
FAQ
What is CVE-2017-12319?
CVE-2017-12319 is a vulnerability with a CVSS score of 5.9 (MEDIUM). A vulnerability in the Border Gateway Protocol (BGP) over an Ethernet Virtual Private Network (EVPN) for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to re...
How severe is CVE-2017-12319?
CVE-2017-12319 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-12319?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ios, Cisco Ios Xe, Cisco 1000 Integrated Services Router, Cisco 1100-4G\/6G Integrated Services Router, Cisco 1100-4G Integrated Services Router.