Security issues were identified and fixed in openjdk (icedtea6)
and icedtea-web:

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality
via unknown vectors related to Networking (CVE-2011-3547).

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality,
integrity, and availability, related to AWT (CVE-2011-3548).

IcedTea6 prior to 1.10.4 allows remote attackers to affect
confidentiality, integrity, and availability via unknown vectors
related to 2D (CVE-2011-3551).

IcedTea6 prior to 1.10.4 allows remote attackers to affect integrity
via unknown vectors related to Networking (CVE-2011-3552).

IcedTea6 prior to 1.10.4 allows remote authenticated users to affect
confidentiality, related to JAXWS (CVE-2011-3553).

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality,
integrity, and availability via unknown vectors related to Scripting
(CVE-2011-3544).

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality,
integrity, and availability via unknown vectors related to
Deserialization (CVE-2011-3521).

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality,
integrity, and availability via unknown vectors (CVE-2011-3554).

A flaw was found in the way the SSL 3 and TLS 1.0 protocols used
block ciphers in cipher-block chaining (CBC) mode. An attacker able
to perform a chosen plain text attack against a connection mixing
trusted and untrusted data could use this flaw to recover portions
of the trusted data sent over the connection (CVE-2011-3389).

Note: This update mitigates the CVE-2011-3389 issue by splitting
the first application data record byte to a separate SSL/TLS
protocol record. This mitigation may cause compatibility issues
with some SSL/TLS implementations and can be disabled using the
jsse.enableCBCProtection boolean property. This can be done on the
command line by appending the flag -Djsse.enableCBCProtection=false
to the java command.

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality
via unknown vectors related to HotSpot (CVE-2011-3558).

IcedTea6 prior to 1.10.4 allows remote attackers to affect
confidentiality, integrity, and availability, related to RMI
(CVE-2011-3556).

IcedTea6 prior to 1.10.4 allows remote attackers to affect
confidentiality, integrity, and availability, related to RMI
(CVE-2011-3557).

IcedTea6 prior to 1.10.4 allows remote untrusted Java Web Start
applications and untrusted Java applets to affect confidentiality
and integrity, related to JSSE (CVE-2011-3560).

Deepak Bhole discovered a flaw in the Same Origin Policy (SOP)
implementation in the IcedTea project Web browser plugin. A
malicious applet could use this flaw to bypass SOP protection and
open connections to any sub-domain of the second-level domain of
the applet's origin, as well as any sub-domain of the domain that
is the suffix of the origin second-level domain. For example,
IcedTea-Web plugin allowed applet from some.host.example.com to
connect to other.host.example.com, www.example.com, and example.com,
as well as www.ample.com or ample.com. (CVE-2011-3377).