38 CFR §1.521

Information received from the Social Security Administration may be filed in the veteran's claims folder without special provisions. Such information will be deemed privileged and may not be released by the Department of Veterans Affairs except that information concerning the amount of social security benefits paid to a claimant or the amount of social security tax contributions made by the claimant may be disclosed to the claimant or his or her duly authorized representative. Any request from outside the Department of Veterans Affairs for other social security information will be referred to the Social Security Administration for such action as they deem proper.