Vulnerability Database

296,172

Total vulnerabilities in the database

CVE-2020-5247

In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. CR, LF or/r, /n) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:P/A:N

CWEs:

Software From Fixed in
ruby-lang / ruby 2.6.0 2.6.4.x
ruby-lang / ruby 2.5.0 2.5.6.x
ruby-lang / ruby 2.4.0 2.4.7.x
ruby-lang / ruby - 2.3.0.x
puma / puma 4.0.0 4.3.2.x
puma / puma - 3.12.3.x
ruby-lang / ruby 2.7.0-preview1 2.7.0-preview1.x
debian / debian_linux 9.0 9.0.x
fedoraproject / fedora 30 30.x
fedoraproject / fedora 31 31.x
fedoraproject / fedora 32 32.x
Ruby icon puma - 3.12.4
Ruby icon puma 4.0.0 4.3.3