The National Bullying Prevention Center claims that there isn't much research on bullying and disabilities, but of the research that has been conducted it has been found that "children with disabilities were two to three times more likely to be bullied than their nondisabled peers. One study shows that 60 percent of students with disabilities report being bullied regularly compared with 25 percent of all students."
Factors that other children may perceive as vulnerability such as social challenges or isolated environments may increase the risk of bullying. For children who don't have disabilities, it may be harder for them to understand certain conditions and causes them to see others with impairments as different. As a result of their condition it is easier for them to be labeled as targets to bullies. Students who are targets of bullying are more likely to have lower grade averages, poor friendships, experience loneliness and possibly depression.
The Departments of Education and Justice have actually implemented some laws to protect children with disabilities who are being bullied. When bullying is directed at a child their established disability and it creates a hostile environment at school, bullying behavior can be labeled as “disability harassment.” Under Section 504 of the Rehabilitation Act of 1973 and Title II of the Americans with Disabilities Act of 1990, the school must address the harassment. Once harassment is reported, the school is obligated to investigate, eliminate the harassment and hostile environment, and prevent it from occurring again.
Links:
http://www.stopbullying.gov/at-risk/groups/special-needs/index.html
http://www.ed.gov/blog/2013/08/keeping-students-with-disabilities-safe-from-bullying/

