<Page> Certification Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 Name of Issuer: Dryden Municipal Series Fund In connection with the Report on Form N-CSR of the above-named issuer that is accompanied by this certification, the undersigned hereby certifies, to his or her knowledge, that: 1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Issuer. Date: October 28, 2003 /s/Judy A. Rice --------------------------------- Judy A. Rice President and Principal Executive Officer Date: October 28, 2003 /s/Grace C. Torres --------------------------------- Grace C. Torres Treasurer and Principal Financial Officer