Unless I'm missing something (Score 1)

A Cisco device receiving a malformed OSPF packet will reset and may take several minutes to become fully functional. This vulnerability may be exploited repeatedly resulting in an extended DOS attack. This issue is documented in bug ID CSCec16481.

I don't see where the article details that an adjacency is necessary. Maybe you could point that out for me? I see 'a malformed packet' as in one packet, received by the router.