The Current North Korea's Missle Capability

Pyongyang possesses a substantial arsenal of short-and medium-range mobile ballistic missiles deployed throughout the country with 500 Hwasong-5 (Scud-B), Hwasong-6(Scud-C) missiles with a range of 300-400 km, and 200 Rodong systems with a range of 1,000km.

 Each of these missiles can carry nuclear warheads as well as chemical and biological warheads. Though their primary role is not to carry the nuclear warheads but to disrupt or slowdown the operations of airbases and military facilities, they are critical to South Korea’s security.

A little more information about Hwasong-5 

Source: https://www.google.co.kr/search?q=Hwasong-5+(Scud-B)&rlz=1C1HLDY_enSG693SG693&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjMr9rG6YTNAhWEg6YKHTPdCtMQ_AUIBygB&biw=1366&bih=643#imgrc=dE8DpWE5gZyWTM%3A

Hwasong 5 is North Korea's first tactical ballistic missile that was in service in 1985, with its first missle prototypes completed in 1984.  Development of the definitive version of Hwasong-5 was at a slow rate with minor improvement over the original Soviet R-17 Elbrus missle.  Range of the Hwasong-5 was increase from 280 to 320km, with a 1000kg warhead attached to it and a slight modification of the Isayev engine.

Hwasong 6

Source: https://www.google.co.kr/search?q=Hwasong-5+(Scud-B)&rlz=1C1HLDY_enSG693SG693&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjMr9rG6YTNAhWEg6YKHTPdCtMQ_AUIBygB&biw=1366&bih=643#tbm=isch&q=Hwasong+6&imgrc=LkLJi6LIAP9E_M%3A