Seventeen classes of mezzanine and subordinated tranches from eight mortgage-backed securitizations issued by Credit Suisse First Boston Mortgage Securities Corp. have been placed under review for possible downgrade by Moody's Investors Service.The affected classes are as follows: series 2001-HE 8, class B; series 2001-HE 12, class M-2 and class B; series 2001-HE 16, class M-2 and class B; series 2001-HE 17, class M-2 and class B; series 2001-HE 20, class M-2 and class B; series 2001-HE 22, class M-2 and class B; series 2001-HE 25, class M-2 and class B; series 2001-HE 30, class M-2, class B, class M-F-2, and class B-F. In addition, Moody's has placed one subordinate tranche under review for possible upgrade. The pools consist of subprime, first-lien, adjustable- and fixed-rate loans. The negative actions were attributed to cumulative losses that exceeded original expectations, particularly as a result of higher-than-expected loss severities.

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