A spokesman for the university says the owner of the gun is a CU employee and is currently on administrative leave.
The injuries did not require hospitalization. 9NEWS received two newstips about the incident on Monday, one of which identified the person who owned the gun as a female staff member.
University spokesman Dan Meyers says campus police are investigating the incident, and that the gun's owner had a concealed carry permit for it.
The University of Colorado for many years enforced a ban on all weapons on its campuses, but in March 2012 the Colorado Supreme Court struck down the university's gun ban, which means visitors and staff members with a valid concealed carry permit are allowed to have guns on campus.
Campus police chief Doug Abraham released a brief statement about the Friday incident saying: "My staff and I continue to be committed to the safety and security of the Anschutz Medical Campus. There is no threat to campus safety or security."
Since the incident took place inside an office at the dental school, very few people were aware that it even happened.
(KUSA-TV © 2012 Multimedia Holdings Corporation)