A little over a week ago HP (Thanks for the link Ugo) put out a fix for an unspecified vulnerability on a fair number of their switches and routers.  Both their Procurve as well as the 3COM ranges.  

CVE-2013-2341  CVSS Score of 7.1 and CVE-2013-2340 CVSS Score of 10

The first one requiring authentication, the second one none and both are remotely exploitable.  The lack of detail in my view is a little bit disappointing. It would be nice to have a few more details, especially since some swithces may not be upgradable.  As the issue is across the HP and 3com range of products I guess we could assume that it has something to do with common code on both devices, which would tend to indicate maybe they are fixing openssl issues from back in february.  But that is just speculation.  If you do know more, I'd be interested in hearing from you.  In the mean time if you have HP or 3COM kit check here (https://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-c03808969-2%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken) and start planning your patches.

I'd start with internet facing equipment first and then start working on the internal network.  Whilst upgrading the software you may want to take the opportunity to take a peek at your authentication and SNMP settings making sure you have changed those from the usual defaults (remember 3COM devices have multiple default accounts) and public or the company name are not good SNMP community strings.

Mark H - Shearwater