No. Junglewise Threat Intelligence has no report of CVE-2019-15224 being exploited in the wild.
How severe is CVE-2019-15224?
Low severity, with a CVSS score of 3, published 20 August 2019.
Which products and versions are affected?
awesome-bot (RubyGems) ECOSYSTEM:introduced=0; bitcoin_vanity (RubyGems) ECOSYSTEM:introduced=0; blockchain_wallet (RubyGems) ECOSYSTEM:introduced=0; capistrano-colors (RubyGems) ECOSYSTEM:introduced=0; and 6 more.
Is there a fix for CVE-2019-15224?
Yes. rest-client (RubyGems): upgrade to 1.7.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-15224?
Check whether you run awesome-bot (RubyGems), bitcoin_vanity (RubyGems), blockchain_wallet (RubyGems) or one of the others listed 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.