CVE-2017-17742

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

5.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 92.3% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2018-04-03 00:00Z8 YR AGO

Last updated

2024-08-05 20:59Z2 YR AGO

Reserved

2017-12-18

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant

Data version

5.1

Document digest

4a3d991cb235564c9e3fde8b2e9f2646384c9344ad505e39e7f8279bc32be57e

• usn.ubuntu.comUSN-3685-1https://usn.ubuntu.com/3685-1/vendor-advisory
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/
• www.securityfocus.com103684http://www.securityfocus.com/bid/103684vdb-entry
• access.redhat.comRHSA-2018:3729https://access.redhat.com/errata/RHSA-2018:3729vendor-advisory
• www.securitytracker.com1042004http://www.securitytracker.com/id/1042004vdb-entry
• access.redhat.comRHSA-2018:3730https://access.redhat.com/errata/RHSA-2018:3730vendor-advisory
• lists.debian.org[debian-lts-announce] 20180423 [SECURITY] [DLA 1358-1] ruby1.9.1 security updatehttps://lists.debian.org/debian-lts-announce/2018/04/msg00023.htmlmailing-list
• access.redhat.comRHSA-2018:3731https://access.redhat.com/errata/RHSA-2018:3731vendor-advisory
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2018/03/28/http-response-splitting-in-webrick-cve-2017-17742/
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/
• lists.debian.org[debian-lts-announce] 20180714 [SECURITY] [DLA 1421-1] ruby2.1 security updatehttps://lists.debian.org/debian-lts-announce/2018/07/msg00012.htmlmailing-list
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/
• www.debian.orgDSA-4259https://www.debian.org/security/2018/dsa-4259vendor-advisory
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/
• lists.debian.org[debian-lts-announce] 20180423 [SECURITY] [DLA 1359-1] ruby1.8 security updatehttps://lists.debian.org/debian-lts-announce/2018/04/msg00024.htmlmailing-list
• lists.opensuse.orgopenSUSE-SU-2019:1771http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.htmlvendor-advisory
• access.redhat.comRHSA-2019:2028https://access.redhat.com/errata/RHSA-2019:2028vendor-advisory
• lists.debian.org[debian-lts-announce] 20191210 [SECURITY] [DLA 2027-1] jruby security updatehttps://lists.debian.org/debian-lts-announce/2019/12/msg00009.htmlmailing-list
• lists.debian.org[debian-lts-announce] 20200816 [SECURITY] [DLA 2330-1] jruby security updatehttps://lists.debian.org/debian-lts-announce/2020/08/msg00027.htmlmailing-list
• lists.debian.org[debian-lts-announce] 20230430 [SECURITY] [DLA 3408-1] jruby security updatehttps://lists.debian.org/debian-lts-announce/2023/04/msg00033.htmlmailing-list