Fitch Rates $187.5MM Credit Suisse First Boston Mortgage Securities CSMC 2009-8R

NEW YORK--(Business Wire)--
Credit Suisse First Boston Mortgage Securities CSMC 2009-8R is rated by Fitch
Ratings as follows:

Group 2 certificates:

--$25,411,000 exchangeable class 2-A-1 'AAA'; Outlook Stable;

--$16,940,000 class 2-A-3 'AAA'; Outlook Stable;

--$4,235,000 class 2-A-4 'AAA'; Outlook Stable;

--$4,236,000 class 2-A-5 'AAA'; Outlook Stable;

--$21,175,000 exchangeable class 2-A-8 'AAA'; Outlook Stable;

--$50 residual class 2-R 'AAA'; Outlook Stable.

Group 4 certificates:

--$18,750,000 exchangeable class 4-A-1 'AAA'; Outlook Stable;

--$16,875,000 class 4-A-3 'AAA'; Outlook Stable;

--$1,875,000 class 4-A-4 'AAA'; Outlook Stable;

--$50 residual class 4-R 'AAA'; Outlook Stable.

Group 5 certificates:

--$50,208,000 exchangeable class 5-A-1 'AAA'; Outlook Stable;

--$35,863,000 class 5-A-3 'AAA'; Outlook Stable;

--$7,172,000 class 5-A-4 'AAA'; Outlook Stable;

--$7,173,000 class 5-A-5 'AAA'; Outlook Stable;

--$43,035,000 exchangeable class 5-A-8 'AAA'; Outlook Stable;

--$50 residual class 5-R 'AAA'; Outlook Stable.

Group 6 certificates:

--$14,832,000 exchangeable class 6-A-1 'AAA'; Outlook Stable;

--$10,877,000 class 6-A-3 'AAA'; Outlook Stable;

--$989,000 class 6-A-4 'AAA'; Outlook Stable;

--$989,000 class 6-A-5 'AAA'; Outlook Stable;

--$989,000 class 6-A-6 'AAA'; Outlook Stable;

--$989,000 class 6-A-7 'AAA'; Outlook Stable;

--$13,843,000 exchangeable class 6-A-8 'AAA'; Outlook Stable;

--$12,854,000 exchangeable class 6-A-9 'AAA'; Outlook Stable;

--$11,866,000 exchangeable class 6-A-10 'AAA'; Outlook Stable;

--$50 residual class 6-R 'AAA'; Outlook Stable.

Group 7 certificates:

--$24,862,000 exchangeable class 7-A-1 'AAA'; Outlook Stable;

--$18,646,000 class 7-A-3 'AAA'; Outlook Stable;

--$1,554,000 class 7-A-4 'AAA'; Outlook Stable;

--$1,554,000 class 7-A-5 'AAA'; Outlook Stable;

--$1,554,000 class 7-A-6 'AAA'; Outlook Stable;

--$1,554,000 class 7-A-7 'AAA'; Outlook Stable;

--$23,308,000 exchangeable class 7-A-8 'AAA'; Outlook Stable;

--$21,754,000 exchangeable class 7-A-9 'AAA'; Outlook Stable;

--$20,200,000 exchangeable class 7-A-10 'AAA'; Outlook Stable;

--$50 residual class 7-R 'AAA'; Outlook Stable.

Group 8 certificates:

--$22,017,000 exchangeable class 8-A-1 'AAA'; Outlook Stable;

--$14,678,000 class 8-A-3 'AAA'; Outlook Stable;

--$1,835,000 class 8-A-4 'AAA'; Outlook Stable;

--$1,834,000 class 8-A-5 'AAA'; Outlook Stable;

--$1,835,000 class 8-A-6 'AAA'; Outlook Stable;

--$1,835,000 class 8-A-7 'AAA'; Outlook Stable;

--$20,182,000 exchangeable class 8-A-8 'AAA'; Outlook Stable;

--$18,347,000 exchangeable class 8-A-9 'AAA'; Outlook Stable;

--$16,513,000 exchangeable class 8-A-10 'AAA'; Outlook Stable;

--$50 residual class 8-R 'AAA'; Outlook Stable.

Group 9 certificates:

--$31,419,000 exchangeable class 9-A-1 'AAA'; Outlook Stable;

--$22,442,000 class 9-A-3 'AAA'; Outlook Stable;

--$2,244,000 class 9-A-4 'AAA'; Outlook Stable;

--$2,244,000 class 9-A-5 'AAA'; Outlook Stable;

--$2,244,000 class 9-A-6 'AAA'; Outlook Stable;

--$2,245,000 class 9-A-7 'AAA'; Outlook Stable;

--$29,174,000 exchangeable class 9-A-8 'AAA'; Outlook Stable;

--$26,930,000 exchangeable class 9-A-9 'AAA'; Outlook Stable;

--$24,686,000 exchangeable class 9-A-10 'AAA'; Outlook Stable;

--$50 residual class 9-R 'AAA'; Outlook Stable.

This transaction contains certain classes designated as Exchangeable
certificates and others as Exchangeable REMIC certificates. The Exchangeable
certificates are exchangeable for certain classes of Exchangeable REMIC
certificates. The Exchangeable REMIC certificates consist of the 2-A-3, 2 A 4, 2
A 5, 2 A 6, 2-A-7, 3 A-3, 3 A 4, 3 A 5, 3 A 6, 3 A-7, 4 A 3, 4 A 4, 5 A 3, 5 A
4, 5 A 5, 5 A 6, 5-A-7, 6 A-2, 6 A-3, 6 A 4, 6 A 5, 6 A 6, 6 A-7, 7 A-2, 7 A 3,
7 A 4, 7 A 5, 7 A 6, 7 A 7, 8 A-2, 8 A 3, 8 A 4, 8 A 5, 8 A 6, 8 A-7, 9 A-2,
9-A-3, 9 A 4, 9 A 5, 9 A 6 and 9 A 7 classes. The 2 A 2, 2 A 6, 2 A 7, 2 A 9, 2
A 10, 3-A-1, through 3-A-14, 4 A 2, 5 A 2, 5 A 6, 5 A 7, 5 A 9, 5 A 10, 6 A 2, 6
A 11, 6 A 12, 6 A 13, 6 A 14, 7 A 2, 7 A 11, 7 A 12, 7 A 13, 7 A 14, 8 A 2, 8 A
11, 8 A 12, 8 A 13, 8 A 14, 9 A 2, 9 A 11, 9 A 12, 9 A 13 and 9 A 14 classes are
not rated by Fitch.

This transaction consists of eight groups. The transaction does not contain a
Group 1. Fitch is not rating the Group 3 certificates. Group 2 is a
resecuritization of 70.58% interest in the Citigroup Mortgage Loan Trust
2007-AR5, class 1-A2A. Group 4 is a resecuritization of 100% interest in the CHL
Mortgage Pass-Through Trust 2007-10, class A-4. Group 5 is a resecuritization of
82.75% interest in the STARM Mortgage Loan Trust 2007-3, class 4-A. Group 6 is a
resecuritization of 82.40% interest in the CHL Mortgage Pass-Through Trust
2007-8, class 1-A-1. Group 7 is a resecuritization of 69.06% interest in the
First Horizon Mortgage Pass-Through Trust 2007-2, class I-A-4. Group 8 is a
resecuritization of 73.39% interest in the C Merrill Lynch Alternative Note
Asset Trust, series 2007 F1, class 2-A7. Group 9 is a resecuritization of 80.66%
and 80.66% interest in the GSR Mortgage Loan Trust 2007-4F, classes 4A-1 and
4A2, respectively. As resecuritizations, the certificates will receive their
cash-flows from the underlying classes of certificates. The underlying
certificates represent beneficial ownership interest in adjustable-rate,
conventional, first lien residential mortgage loans, substantially all of which
have original terms to stated maturity of 30 years.

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.

Fitch Ratings, New York
Nicole Antompietri, 212-908-9134
Wen Hsu, 212-908-0633
or
Media Relations:
Sandro Scenga, 212-908-0278
Email: sandro.scenga@fitchratings.com

Copyright Business Wire 2009