A high CPU consumption denial of service vulnerability exists in the EX4600 and QFX Series switches listed above. This issue can be triggered by remote unauthenticated network-based attackers. Transit traffic is unaffected, but CLI responsiveness may be partially impacted. This issue was caused by a regression introduced in Junos OS 13.1X51-D15 and higher. Earlier releases are unaffected by this vulnerability. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue has been assigned CVE-2015-5357 .
The following software releases have been updated to resolve this specific issue: Junos OS 13.2X51-D26, 13.2X51-D30, 14.1X53-D10, and all subsequent releases. This issue is being tracked as PR 959279 and is visible on the Customer Support website. KB16765 [juniper.net] - "In which releases are vulnerabilities fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment by designing a control plane firewall filter to block all incoming traffic except for those services and ports explicitly needed. Use access lists or firewall filters to limit access to the router only from trusted, administrative networks or hosts.
2015-07-08: Initial publication 2015-07-22: Clarified partial availability impact