Yes. symfony/framework-bundle (Packagist): upgrade to 2.3.18 or later; symfony/symfony (Packagist): upgrade to 2.3.19 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2014-4931?
Check whether you run symfony/framework-bundle (Packagist) or symfony/symfony (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
symfony/framework-bundle (Packagist): upgrade to 2.3.18 or later
composer require symfony/framework-bundle:^2.3.18
symfony/symfony (Packagist): upgrade to 2.3.19 or later