CVE-2014-5245 is about being able to access ESI URLs even behind a trusted proxy.
CVE-2014-5244 is about a potential denial of service with a malicious HTTP Host header.
Symfony 2.3.18, 2.4.8, and 2.5.2 have just been released; they contain a security fix for the Translator class provided by FrameworkBundle (CVE-2014-4931).
Symfony 2.0.25, 2.1.13, 2.2.9, and 2.3.6 have just been released; they contain a security fix for the Security component (CVE-2013-5958).
A security issue has been discovered in FOSUserBundle (CVE-2013-5750).
Symfony 2.0.24, 2.1.12, 2.2.5, and 2.3.3 have just been released and they contain security fixes for the Validator component (CVE-2013-4751) and the HttpFoundation component (CVE-2013-4752).
Symfony 2.0.22 and Symfony 2.1.7 have just been released and they both contain security fixes for the YAML component (CVE-2013-1348 and CVE-2013-1397).
Symfony 2.0.20 and Symfony 2.1.5 have just been released and they both contain two security fixes.
Symfony 2.0.18 and 2.1.4 have been released with a security issue fix.
symfony 1.4.20 has just been released. It contains a security fix.