Fitch Affirms $378.3MM & Downgrades $691.6MM from CSFB HEAT 2007-2.

NEW YORK -- Fitch Ratings has taken the following rating actions on classes from Credit Suisse First Boston (CSFB) Home Equity Asset Trust (HEAT) transactions. Affirmations total $378.3 million and downgrades total $691.6 million. In addition, $677.2 million is placed on Rating Watch Negative. Break Loss percentages (BL) and Loss Coverage Ratios (LCR) for each class are included with the rating actions as follows:

CSFB HEAT 2007-2

--$420 million class 1-A-1 downgraded to 'AA-' from 'AAA' (BL: 37.93, LCR: 1.76) and placed on Rating Watch Negative;

--$226.3 million class 2-A-1 affirmed at 'AAA' (BL: 68.86, LCR: 3.19);

--$73 million class 2-A-2 affirmed at 'AAA' (BL: 56.84, LCR: 2.63);

--$79 million class 2-A-3 affirmed at 'AAA' (BL: 43.65, LCR: 2.02);

--$40 million class 2-A-4 downgraded to 'AA-' from 'AAA' (BL: 37.78, LCR: 1.75) and placed on Rating Watch Negative;

--$48 million class M-1 downgraded to 'A' from 'AA+' (BL: 33.39, LCR: 1.55) and placed on Rating Watch Negative;

--$45 million class M-2 downgraded to 'BBB+' from 'AA+' (BL: 29.32, LCR: 1.36) and placed on Rating Watch Negative;

--$26.4 million class M-3 downgraded to 'BBB' from 'AA' (BL: 26.86, LCR: 1.24) and placed on Rating Watch Negative;

--$22.8 million class M-4 downgraded to 'BBB-' from 'AA-' (BL: 24.72, LCR: 1.15) and placed on Rating Watch Negative;

--$21.6 million class M-5 downgraded to 'BB' from 'A+' (BL: 22.68, LCR: 1.05) and placed on Rating Watch Negative;

--$20.4 million class M-6 downgraded to 'BB' from 'A' (BL: 20.49, LCR: 0.95) and placed on Rating Watch Negative;

--$18.6 million class M-7 downgraded to 'B' from 'BBB+' (BL: 18.42, LCR: 0.85) and placed on Rating Watch Negative;

--$14.4 million class M-8 downgraded to 'B' from 'BBB' (BL: 16.92, LCR: 0.78) and placed on Rating Watch Negative;

--$14.4 million class M-9 downgraded to 'CCC' from 'BBB-' (BL: 15.70, LCR: 0.73).

Deal Summary

--Originators: Equifirst (39.7%), ResMAE (37.7%);

--60+ day Delinquency: 14.59%;

--Realized Losses to date (% of Original Balance): 0.09%;

--Expected Remaining Losses (% of Current Balance): 21.58%;

--Cumulative Expected Losses (% of Original Balance): 20.24 %.

The rating actions are based on changes that Fitch has made to its subprime loss forecasting assumptions. The updated assumptions better capture the deteriorating performance of pools from 2007, 2006 and late 2005 with regard to continued poor loan performance and home price weakness. Additional details are available in the following research, also available at www.fitchratings.com:

--'Downgrade Criteria for Recent Vintage U.S. Subprime RMBS' (Aug. 8, 2007);

--'U.S. Subprime RMBS/HEL Upgrade/Downgrade Criteria' (June 12 ,2007).

All of Fitch's ratings criteria for US subprime RMBS available at www.fitchratings.com/subprime. For a list of deals currently under analysis please visit www.fitchratings.com/smartview.

Fitch's rating definitions and the terms of use of such ratings are available on the agency's public site, www.fitchratings.com. Published ratings, criteria and methodologies are available from this site, at all times. Fitch's code of conduct, confidentiality, conflicts of interest, affiliate firewall, compliance and other relevant policies and procedures are also available from the 'Code of Conduct' section of this site.