"deficient security" is correct and usable in written English.
It is often used in legal or corporate contexts to describe the lack of proper security measures or precautions. Example: The company was sued for negligence due to its deficient security measures, resulting in a data breach that compromised customers' personal information.
Last place goes to North Korea, a police state that the report finds to be seriously deficient on issues of atomic security, and next-to-last to Pakistan.
Flynn implied Spangenberg's age impeded him from fitting in to Uber's youth-driven culture (prompting Spangenberg to include age discrimination claims in his lawsuit) and said that his work was deficient after he reported the security problems, Spangenberg claims.
The Federal Aviation Administration, in particular, has known since at least the last gulf war (and earlier, by some accounts) that security at airports is deficient.
But his surrogates argued Monday that he did have the economic knowledge to go with his experience in foreign policy and national security, and that Mr. Obama was deficient in all of those areas.
The bureau's own security safeguards seem to have been gravely deficient.
Despite repeated warnings from Washington of imminent terrorist attacks, security precautions at foreign compounds were grossly deficient.
It has been deficient and often at cross purposes with our national security.
During this time, Dwolla had many other layers of data security practices and technologies in place that were not found to be deficient, which we believe helped to prevent harm to consumers.
Ashcroft's guidance was deficient: though it expressly banned racial profiling by federal law enforcement agencies, it left broad exemptions for national security and border integrity investigations.
The judge reasoned that the government's justifications for keeping the pictures secret were "deficient" and "not sufficiently individualized" so as to explain why their release would pose a danger to national security.
