CVE-2020-5249CWE-113

HTTP Response Splitting (Early Hints) in Puma

Medium · published March 2, 2020

CVSS v3.1
6.5
EPSS
2%
Percentile
75.2
In the wild
Unconfirmed
What it is

In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character 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-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.01571 · 75.2th percentile
Weakness
CWE-113 · Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Published
2020-03-02T15:20Z
EPSS history
Timeline
  • 02 MAR 15:20Z
    HTTP Response Splitting (Early Hints) in Puma
    cvelistv5