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Cisco NX-OS Malformed IP Packet Denial of Service Vulnerability (cisco-sa-20120215-nxos) CVE-2012-0352

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CVSSv3 Score
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Vulnerability description

Cisco NX-OS Software is affected by a denial of service (DoS) vulnerability that could cause Cisco Nexus 1000v, 1010, 5000, and 7000 Series Switches, and the Cisco Virtual Security Gateway (VSG) for Nexus 1000V Series Switches, that are running affected versions of Cisco NX-OS Software to reload when the IP stack processes a malformed IP packet.

Risk description

The vulnerability is in the operating systems IP stack and any feature that makes use of services offered by the IP stack to parse IP packets is affected. For instance, the following scenarios may trigger the vulnerability because they imply that Layer 4 (UDP or TCP) information is required to be able to perform the configured function: - A malformed, transit IP packet that would normally be forwarded by the switch is received and the Time-to-live (TTL) is 1. In this case, an ICMP error message (time exceeded) needs to be generated. During generation of this ICMP message, the bug could be triggered. - Policy-based routing is in use, and to make a routing decision, an incoming packet needs to be parsed. If the packet is a malformed TCP segment and the routing policy uses TCP information for routing decisions, then this bug could be triggered. - An egress Access Control List (ACL) is applied to an interface and a malformed IP packet that needs to be forwarded through that interface is received. Note: This list is not exhaustive. It contains some of the scenarios that have been confirmed to trigger the vulnerability described in this document. Other scenarios that require accessing Layer 4 information of a malformed IP packet may also result in the vulnerability being triggered. An attacker can exploit this issue to cause the device to crash, denying service to legitimate users.


See the referenced vendor advisory for a solution.

Not available
Detectable with
Network Scanner
Scan engine
Exploitable with Sniper
CVE Published
Feb 16, 2012
Detection added at
Software Type
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