Unable to access Web Interface-Weak Diffie-Hellman and the Logjam Attack

[Maurice Hawley]

I have suddenly been prevented from accessing my web based interface for my RV043G gigabit dual WAN VPN Router.  In Chrome, safari and Firefox I am getting

Server has a weak ephemeral Diffie-Hellman public key

ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY

I finally was able to access it through IE.

I have seen this addressed for other products, but not for the RV042G or family.  Today was the first time i tried accessing the Web interface in several weeks, so I am not sure how long the problem has existed for this product.  I did recently upgrade to Chrome 64 bit.  Anyway, I am the administrator for my small home network, what can I do to fix this problem.  I updated to the newest firmware today, v4.2.3.06 (Mar 19 2015 17:20:13).  Any suggestions would be appreciated.  I have looked all over the Cisco site but have not found anything addressing this problem with this particular router.

Thanks

[Bigoncisco]

Hi Maurice,

Here is a link to an excellent article about the problem.

Regards

[Maurice Hawley]

Thanks, Bigoncisco.  Great read!  Now if we can just get Cisco to fix our equipment.