Fitch Affirms $83.5MM & Downgrades $11.5MM from CSFB HEMT 2005-2.

NEW YORK -- Fitch Ratings has taken the following rating actions on Credit Suisse First Boston (CSFB) Mortgage Securities Corp. Home Equity Mortgage Trust (HEMT) 2005-2 mortgage pass-through certificates. Affirmations total $83.5 million and downgrades total $11.5 million. In addition, the $11.5 million of downgraded bonds were also placed on Rating Watch Negative. Break Loss percentages (BL) and Loss Coverage Ratios (LCR) for each class, rated B or higher, are included with the rating actions as follows:

CSFB HEMT 2005-2

--$8.6 million class M-2 affirmed at 'AA' (BL: 96.80, LCR: 4.62);

--$11.5 million class M-3 affirmed at 'AA-' (BL: 88.55, LCR: 4.22);

--$11.7 million class M-4 affirmed at 'A+' (BL: 77.60, LCR: 3.7);

--$11.5 million class M-5 affirmed at 'A' (BL: 66.09, LCR: 3.15);

--$10.8 million class M-6 affirmed at 'A-' (BL: 55.10, LCR: 2.63);

--$10.8 million class M-7 affirmed at 'BBB+' (BL: 44.03, LCR: 2.1);

--$10.8 million class M-8 affirmed at 'BBB' (BL: 26.13, LCR: 1.25);

--$7.6 million class M-9 affirmed at 'BBB-' (BL: 22.99, LCR: 1.1);

--$7.9 million class B-1 downgraded to 'BB-' from 'BB+' (BL: 19.11, LCR: 0.91), placed on Rating Watch Negative;

--$3.6 million class B-2 downgraded to 'B' from 'BB' (BL: 17.72, LCR: 0.85), placed on Rating Watch Negative;

Deal Summary

--Originators: Various

--60+ day Delinquency: 8.13%

--Realized Losses to date (% of Original Balance): 3.56%;

--Expected Remaining Losses (% of Current Balance): 20.97%;

--Cumulative Expected Losses (% of Original Balance): 7.96%.

The information above is based off the October 2007 remittance period.

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. Minimum LCR's specifically for subprime second lien transactions are as follows: 'AAA':2.00; 'AA':1.75; 'A':1.50; 'BBB':1.20; 'BB':0.95; 'B':0.75. Additional details are available in the following research, 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 is available at www.fitchratings.com/subprime.

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.