CVE-2019-16254
5.3
MEDIUM
CVSS 3.1
EPSS 0.71%
Description
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.
How to fix CVE-2019-16254
To remediate CVE-2019-16254, upgrade the affected package to a fixed version below.
- —upgrade to 2.5.7-r0 or later
- —upgrade to 9.3.9.0+ds-1 or later
Is CVE-2019-16254 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.5.7-r0
- from 0, < 9.3.9.0+ds-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |