CVE-2019-16254

mediumpriority · track · 23EPSS 0.046 · 92 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

4.57% (92nd) EPSS

CVSS 5 · medium

Is it mine?

33 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-74USprimaryCWE-74US

affected products (33)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Open Source Arch Linuxall versionscert_bundDEcpe:/o:archlinux:archlinux:-
Open Source Ruby 2.4.8all versionscert_bundDEcpe:/a:ruby-lang:ruby:2.4.8
Open Source Ruby 2.5.7all versionscert_bundDEcpe:/a:ruby-lang:ruby:2.5.7
Open Source Ruby 2.6.5all versionscert_bundDEcpe:/a:ruby-lang:ruby:2.6.5
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
n/a n/a≤ n/aenisa_euvdEU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Oracle Corp. GraalVM Enterprise Edition≤ 19.3.0.2fstec_bduRU
Ruby Team Ruby≤ 2.3.0fstec_bduRU
Ruby Team Ruby2.4.0 → 2.4.7fstec_bduRU
Ruby Team Ruby2.5.0 → 2.5.6fstec_bduRU
Ruby Team Ruby2.6.0 → 2.6.4fstec_bduRU
АО «ИВК» Альт 8 СПall versionsfstec_bduRU
АО «Концерн ВНИИНС» ОС ОН «Стрелец»≤ 16.01.2023fstec_bduRU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.9fstec_bduRU

showing 20 of 33

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-1110Ruby: Mehrere SchwachstellenDeutsch2019-10-01csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Ruby ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Daten zu manipulieren oder einen Denial of Servie zu verursachen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2019-11-26modified 2026-06-17

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+5979 more

references (82)

External citations — patches, advisories, analysis.

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