A serious flaw in Cisco Systems’ switch software puts computer networks at risk of cyber attack.
A vulnerability in Cisco's Internetwork Operating System (IOS) could be exploited by remote attackers to crash or run malicious code on devices that run IOS.
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IOS runs on Cisco's routers and switches, which make up a large portion of the internet's infrastructure, as well as being used across enterprises.
In an advisory note, Cisco said, "Successful exploitation of the vulnerability on Cisco IOS may result in a reload of the device or execution of arbitrary code. Repeated exploitation could result in a sustained denial of service attack.”
The flaw does not affect all versions of IOS. Cisco has issued a patch to protect IOS versions 12.2ZH, 12.2ZL, 12.3, 12.3T, 12.4 and 12.4T.