H2O · H2O · CVE-2016-4864
**Name of the Vulnerable Software and Affected Versions**
H2O versions 2.0.3 and earlier
H2O version 2.1.0-beta2 and earlier
**Description**
The issue allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file. This can be achieved through various means such as fastcgi, mruby, proxy, redirect, or reproxy.
**Recommendations**
For H2O versions 2.0.3 and earlier, update to a version later than 2.0.3 to resolve the issue.
For H2O version 2.1.0-beta2 and earlier, update to a version later than 2.1.0-beta2 to resolve the issue.