Threat Level: green Handler on Duty: Brad Duncan

SANS ISC: Juniper routers may crash on certain malformed packets - SANS Internet Storm Center SANS ISC InfoSec Forums

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Juniper routers may crash on certain malformed packets

I personally don't have access to the full vendor bulletin, but word is out that Juniper JUNOS routers can be crashed or made to reboot with easily spoofed malformed packets. If you are using Juniper routers, make sure to log in to the Juniper support portal to read their security alert.


385 Posts
ISC Handler
Jan 7th 2010
Also a lot of other bugs that could be easy to exploit. Suggest everyone with Junipers checks out
(registration required)
or Juniper Technical Assistance Center(JTAC) at, or (888) 314-JTAC / +1 408-745-2121

45 Posts
In summary, JunOS builds built on or after 27th March 2009 have all the fixes - so you may already be patched.

45 Posts
Here are the details:
4 Posts
Some additional information + video can be found here:

2 Posts

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