The credit for this is due to Oliphant on dslreports.com who posted in the security forum there this link:
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This fixes 3 vulnerabilities corrected a few months earlier in the equivalent Symantec sister routers (100, 200 and 200R)However, in looking at the release notes for the various firmware revisions for the Symantec routers it would appear that it is just the security issues that have been addressed and not the operability ones - but I may be incorrect. The various firmware revisions and notes for, for example, the 200 are available here:
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Peter (remove the Xs in the email address to reply via email)