CVE-2019-16254 in Ruby Programming Language and Debian Products
Published on November 26, 2019
Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.
Products Associated with CVE-2019-16254
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Vulnerable Packages
The following package name and versions may be associated with CVE-2019-16254
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| rubygems | puma | < 3.12.3 | 3.12.4 |
| rubygems | puma | >= 4.0.0, < 4.3.2 | 4.3.3 |
Exploit Probability
EPSS
0.71%
Percentile
71.71%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.