A Denial of Service (DoS) issue has been found in Juniper Networks NetScreen Firewall products. When encountered, this issue can cause the device to crash and reboot. If an attacker were to repeatedly exploit the issue a sustained denial of service could take place on the device. The issue is caused when a certain sequence of malformed IPv6 packets are sent to the device’s IP directly. This issue will not take place if the packets are traversing the network through the firewall.Juniper SIRT is not aware of any malicious exploitation of this vulnerability.This issue has been assigned CVE-2014-3814

 A software update for ScreenOS has been released to resolve this issue. The release containing the fix includes ScreenOS 6.3r17 and subsequent releasesThis issue is being tracked as PR 804557 and is visible on the Customer Support website.KB16765 – “In which releases are vulnerabilities fixed?” describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.

 There is no workaround for this issue. An upgrade to a fixed version of the software for the fix. How to obtain fixed software:Software release Service Packages are available at http://support.juniper.net from the “Download Software” links. Select “Screen OS” and find 6.3r17 for your needed platform.

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