CVE-2019-16254

MEDIUM
5.3
CVSS Score
Published: November 26, 2019 at 12:00 AM UTC
Updated: June 17, 2026 at 02:22 AM UTC
2 products affected across 2 vendorsDebian LinuxRuby

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Severity
MEDIUM5.3
Exploit prediction
EPSS 5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

95%
v ≤ 2.3.02.4.0 ≤ v ≤ 2.4.72.5.0 ≤ v ≤ 2.5.62.6.0 ≤ v ≤ 2.6.4

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74

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