EXHIBIT 5.1







                                January 23, 1998

          CyberMedia, Inc.
          3000 Ocean Park Blvd., Suite 2001
          Santa Monica, CA 90405

                   Re:  Registration Statement on Form S-8

          Ladies and Gentlemen:

                   We have examined the Registration Statement on Form S-8 to be
          filed by you with the Securities  and Exchange  Commission on or about
          January 26, 1998 (the  "Registration  Statement"),  in connection with
          the  registration  under the  Securities  Act of 1933, as amended,  of
          500,000  shares of your  Common  Stock  (the  "Shares")  reserved  for
          issuance under the Amended 1993 Stock Plan (the "Plan"). As your legal
          counsel,  we have  examined the  proceedings  taken and proposed to be
          taken  in  connection   with  the   issuance,   sale  and  payment  of
          consideration for the Shares to be issued under the Plan.

                   It is our opinion  that,  when issued and sold in  compliance
          with applicable  prospectus  delivery  requirements  and in the manner
          referred to in the Plan and pursuant to the agreements which accompany
          the Plan,  the Shares will be legally and validly  issued,  fully paid
          and non-assessable.

                   We  consent  to the use of this  opinion as an exhibit to the
          Registration  Statement  and  further  consent  to the use of our name
          wherever  appearing in the  Registration  Statement and any amendments
          thereto.

                                   Sincerely,

                                              WILSON SONSINI GOODRICH & ROSATI
                                                      Professional Corporation

                                          /s/ Wilson Sonsini Goodrich & Rosati