In Korea, there are about 376 ships pending at a trading port for a long time, neglected ships on public waters, or supervised and preserved ships, and these vessels are causing social problems, such as causing about 36 marine pollution accidents since 2019. These vulnerable ships are 35 years old, 1.5 times the age of general ships, and there are many single-ship structures vulnerable to marine pollution, causing frequent flooding and sinking accidents, as well as the number of pollution accidents is about 5 times higher and the outflow is 1.5 times higher than that of general ships. Nevertheless, these vulnerable ships are exempted from ship inspection through ship mooring reports and submission of reasons for mooring and are excluded from the environmental and safety management system, resulting in an imbalance in the degree of management compared to vulnerability. Management and institutional supplementation are needed to reduce these risks. First of all, in terms of management, it is necessary to conduct a status survey at the time of the first mooring report, and to actively carry out administrative measures such as movement orders and hull treatment for ships that maliciously neglect pollution through periodic surveys even after the mooring report. In terms of legal and institutional aspects, the government needs to prepare ground laws that allow owners to preemptively carry out risk reduction measures by conducting preliminary on-site surveys, assigning pollution risk assessment and pollution prevention measures to owners, and requiring the government to take direct action in case of non-implementation.