RATINGS RATIONALE

The action is a result of the recent performance review of Scratch and Dent pools and reflect Moody's updated loss expectations on this pool. The downgrades are primarily due to deteriorating collateral performance.

The methodologies used in this rating were "Moody's Approach to Rating US Residential Mortgage-Backed Securities" published in December 2008, and "US RMBS Surveillance Methodology for Scratch and Dent" published in May 2011. Please see the Credit Policy page on www.moodys.com for a copy of these methodologies.

Moody's adjusts the methodologies noted above for Moody's current view on loan modifications. As a result of an extension of the Home Affordable Modification Program (HAMP) to 2013 and an increased use of private modifications, Moody's is extending its previous view that loan modifications will only occur through the end of 2012. It is now assuming that the loan modifications will continue at current levels until the end of 2013.

The primary source of assumption uncertainty is the uncertainty in our central macroeconomic forecast and performance volatility due to servicer-related issues. The unemployment rate fell from 9.0% in April 2011 to 7.9% in October 2012. Moody's expects house prices to drop another 1% from their 4Q2011 levels before gradually rising towards the end of 2013. Performance of RMBS continues to remain highly dependent on servicer procedures. Any change resulting from servicing transfers or other policy or regulatory change can impact the performance of these transactions.

Complete rating actions are as follows:

Issuer: CSFB Mortgage Pass-Through Certificates, Series 2004-CF1

Cl. M-1, Downgraded to B1 (sf); previously on May 19, 2011 Downgraded to Ba1 (sf)

Cl. B, Downgraded to C (sf); previously on Mar 30, 2009 Downgraded to Ca (sf)

A list of these actions including CUSIP identifiers may be found at:

Excel: http://www.moodys.com/viewresearchdoc.aspx?docid=PBS_SF307880

A list of updated estimated pool losses and sensitivity analysis is being posted on an ongoing basis for the duration of this review period and may be found at:

Excel: http://www.moodys.com/viewresearchdoc.aspx?docid=PBS_SF247004

For more information please see www.moodys.com.

REGULATORY DISCLOSURES

The Global Scale Credit Ratings on this press release that are issued by one of Moody's affiliates outside the EU are endorsed by Moody's Investors Service Ltd., One Canada Square, Canary Wharf, London E 14 5FA, UK, in accordance with Art.4 paragraph 3 of the Regulation (EC) No 1060/2009 on Credit Rating Agencies. Further information on the EU endorsement status and on the Moody's office that has issued a particular Credit Rating is available on www.moodys.com.

For ratings issued on a program, series or category/class of debt, this announcement provides relevant regulatory disclosures in relation to each rating of a subsequently issued bond or note of the same series or category/class of debt or pursuant to a program for which the ratings are derived exclusively from existing ratings in accordance with Moody's rating practices. For ratings issued on a support provider, this announcement provides relevant regulatory disclosures in relation to the rating action on the support provider and in relation to each particular rating action for securities that derive their credit ratings from the support provider's credit rating. For provisional ratings, this announcement provides relevant regulatory disclosures in relation to the provisional rating assigned, and in relation to a definitive rating that may be assigned subsequent to the final issuance of the debt, in each case where the transaction structure and terms have not changed prior to the assignment of the definitive rating in a manner that would have affected the rating. For further information please see the ratings tab on the issuer/entity page for the respective issuer on www.moodys.com.

Information sources used to prepare the rating are the following : parties involved in the ratings, parties not involved in the ratings, public information, confidential and proprietary Moody's Investors Service information, and confidential and proprietary Moody's Analytics information.

Moody's received and took into account one or more third party assessments on the due diligence performed regarding the underlying assets or financial instruments in this transaction and the assessments had a neutral impact on the rating.

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The date on which some ratings were first released goes back to a time before Moody's ratings were fully digitized and accurate data may not be available. Consequently, Moody's provides a date that it believes is the most reliable and accurate based on the information that is available to it. Please see the ratings disclosure page on our website www.moodys.com for further information.

Please see www.moodys.com for any updates on changes to the lead rating analyst and to the Moody's legal entity that has issued the rating.

Max Sauray Associate Analyst Structured Finance Group Moody'sInvestors Service, Inc.250 Greenwich StreetNew York, NY 10007 U.S.A. JOURNALISTS: 212-553-0376 SUBSCRIBERS: 212-553-1653Amita Shrivastava VP - Senior Credit Officer Structured Finance Group JOURNALISTS: 212-553-0376 SUBSCRIBERS: 212-553-1653 Releasing Office: Moody's Investors Service, Inc.250 Greenwich StreetNew York, NY 10007 U.S.A. JOURNALISTS: 212-553-0376 SUBSCRIBERS: 212-553-1653(C) 2012 Moody's Investors Service, Inc. and/or its licensors and affiliates (collectively, "MOODY'S"). All rights reserved.

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