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Cisco updated its IOS XR network operating system to address a flaw attackers could leverage to cause a denial-of-service (DoS) on CRS-3 Carrier Routing Systems.

A medium severity vulnerability (CVE-2015-0769) exists in the IPv6 processing code of IOS XR Software installed on CRS-3 Carrier Routing Systems, according to an advisory published by Cisco. An attacker can cause the line card to reload by sending specially crafted IPv6 packets.

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Exploiting this vulnerability, an attacker could cause an extended DoS condition, Cisco said in its advisory.

The company said the flaw affects Cisco CRS-3 Carrier Routing System devices only if they are running a vulnerable release of IOS XR, if they have CRS-MSC-140G, CRS-FP140 or CRS-LSP line cards installed on the chassis, and if the line card configuration is for IPv6.

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The vulnerability affects the following Cisco IOS XR releases: 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.1, 4.1.2, and 4.2.0.

Cisco released software maintenance updates (SMUs) to address the issue in versions 4.1.0, 4.1.1, 4.1.2, and 4.2.0. Customers who use 4.0.x versions should upgrade their installations to a currently supported release.

The company said their own team discovered the vulnerability and there is no evidence it is undergoing exploitation.

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