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Cisco IOS Software TCP Denial of Service Vulnerability

Information

Severity

Severity

Medium

Family

Family

CISCO

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/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 handling of remote TCP connections in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition due to low memory. The vulnerability is due to the handling of out-of-order, or otherwise invalid, TCP packets on a remote connection to an affected device. An attacker could exploit this vulnerability by connecting to the device and then sending crafted TCP packets that are out of order or have invalid flags. An exploit could allow the attacker to cause the device to report low-memory warnings, which could in turn cause a partial DoS condition. This vulnerability was initially found for Secure Shell Host (SSH) remote connections, but it could also affect other remote connections to the device. Cisco will release software updates that address this vulnerability. There are no workarounds that address this vulnerability.

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)