Currently, only Internet Explorer is safe from the Logjam vulnerability.

How to: Secure Chrome against Logjam

How to: Secure Firefox against Logjam

Browser/OS	Windows	OS X	iOS	Android
IE 11	Safe (5/20/15 CW)
Safari		Vulnerable (5/20/15 CW)	Vulnerable (5/20/15 CW)
Chrome 43	Vulnerable (5/25/15 SOT)	Vulnerable (5/20/15 CW)	Vulnerable (5/20/15 CW)	Vulnerable (5/20/15 CW)
Firefox 38	Vulnerable (5/30/15 SOT)	Vulnerable (5/20/15 CW)		Vulnerable (5/20/15 CW)
Android browser				Vulnerable (5/20/15 CW)

This article builds upon the information in the Computerworld (CW) article published 5/20/15

Test your client (browser):

• https://weakdh.org/
• https://www.ssllabs.com/ssltest/viewMyClient.html

Patches / Safe Versions

5/12/15 – Microsoft patched IE 11 see MS15-055

5/22/15 – Mozilla released the “Disable DHE” add-on that “disables ephemeral Diffie-Hellman cipher suites that are vulnerable to the logjam attack” for Firefox versions 20.0 – 38.*

 

SOT Testing

5/25/15 – Firefox 38.0.1

5/30/15 – Firefox 38.0.1 no updated release – still vulnerable

Additional information

Schannel – Secure Channel