Exploited
medium
6.5
CWE
399
Advisory Published
Updated

CVE-2017-12238: Cisco Catalyst 6800 Series Switches VPLS Denial-of-Service Vulnerability

First published: Thu Sep 28 2017(Updated: )

A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS 15.0 through 15.4 for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resulting in a denial of service (DoS) condition. The vulnerability is due to a memory management issue in the affected software. An attacker could exploit this vulnerability by creating a large number of VPLS-generated MAC entries in the MAC address table of an affected device. A successful exploit could allow the attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resulting in a DoS condition. This vulnerability affects Cisco Catalyst 6800 Series Switches that are running a vulnerable release of Cisco IOS Software and have a Cisco C6800-16P10G or C6800-16P10G-XL line card in use with Supervisor Engine 6T. To be vulnerable, the device must also be configured with VPLS and the C6800-16P10G or C6800-16P10G-XL line card needs to be the core-facing MPLS interfaces. Cisco Bug IDs: CSCva61927.

Credit: ykramarz@cisco.com psirt@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS=15.0\(1\)sy1
Cisco IOS=15.1\(1\)sy
Cisco IOS=15.1\(1\)sy1
Cisco IOS=15.1\(1\)sy2
Cisco IOS=15.1\(1\)sy3
Cisco IOS=15.1\(1\)sy4
Cisco IOS=15.1\(1\)sy5
Cisco IOS=15.1\(1\)sy6
Cisco IOS=15.1\(2\)sy
Cisco IOS=15.1\(2\)sy1
Cisco IOS=15.1\(2\)sy2
Cisco IOS=15.1\(2\)sy3
Cisco IOS=15.1\(2\)sy4
Cisco IOS=15.1\(2\)sy4a
Cisco IOS=15.1\(2\)sy5
Cisco IOS=15.1\(2\)sy6
Cisco IOS=15.1\(2\)sy7
Cisco IOS=15.1\(2\)sy8
Cisco IOS=15.1\(2\)sy9
Cisco IOS=15.1\(2\)sy10
Cisco IOS=15.2\(1\)sy
Cisco IOS=15.2\(1\)sy0a
Cisco IOS=15.2\(1\)sy1
Cisco IOS=15.2\(1\)sy1a
Cisco IOS=15.2\(1\)sy2
Cisco IOS=15.2\(1\)sy3
Cisco IOS=15.2\(1\)sy4
Cisco IOS=15.2\(2\)sy
Cisco IOS=15.2\(2\)sy1
Cisco IOS=15.2\(2\)sy2
Cisco IOS=15.3\(1\)sy
Cisco IOS=15.3\(1\)sy1
Cisco IOS=15.3\(1\)sy2
Cisco IOS=15.4\(1\)sy
Cisco Catalyst 6800 Series Switches
All of
Cisco IOS>=15.0<=15.4
Any of
Cisco C6800-16P10G
Cisco Catalyst 6800 Series
Cisco Catalyst 6000
Cisco Catalyst 6000=2.2\(1a\)
Cisco Catalyst 6000=3.1\(1a\)
Cisco Catalyst 6000 ws-svc-nam-2=2.2\(1a\)
Cisco Catalyst 6000 ws-svc-nam-2=3.1\(1a\)
Cisco Catalyst 6500 ws-x6380-nam=2.1\(2\)
Cisco Catalyst 6500 ws-x6380-nam=3.1\(1a\)
Cisco Catalyst 6500-E
Cisco Catalyst 6500-E
Cisco Catalyst 6500 Wireless Services Module=2.2\(1a\)
Cisco Catalyst 6500 Wireless Services Module=3.1\(1a\)
Cisco Catalyst 6000 ws-svc-nam-2=2.2\(1a\)
Cisco Catalyst 6000 ws-svc-nam-2=3.1\(1a\)
Cisco Catalyst 6500 Series Switches=2.1\(2\)
Cisco Catalyst 6500 Series Switches=3.1\(1a\)
cisco catalyst 6503-e firmware
Cisco Catalyst 6504-E Firmware
Cisco Catalyst 6506-E Firmware
Cisco Catalyst 6509-E Firmware
Cisco Catalyst 6509-NEB-A Firmware
Cisco Catalyst 6509-V-E
Cisco Catalyst 6513
Cisco Catalyst 6513

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2017-12238?

    CVE-2017-12238 is classified as a high severity vulnerability due to its potential to cause denial of service.

  • How do I fix CVE-2017-12238?

    To fix CVE-2017-12238, upgrade affected Cisco IOS versions to a non-vulnerable release.

  • Which Cisco products are affected by CVE-2017-12238?

    CVE-2017-12238 affects Cisco IOS versions 15.0 through 15.4 on the Catalyst 6800 Series Switches.

  • Can CVE-2017-12238 be exploited remotely?

    CVE-2017-12238 cannot be exploited remotely as it requires adjacency to the target network.

  • What kind of attack can CVE-2017-12238 facilitate?

    CVE-2017-12238 can facilitate a denial of service attack by causing the affected line card to crash.

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