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Vulnerability record · CVE-2017-10784 · published 19 September 2017

CVE-2017-10784: Ruby-lang ruby improper authentication vulnerability

Ruby Lang · Ruby

The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.

8.8 CVSS 3.0 High EPSS 16% · top 3.1% CWE-287 · Improper authentication
8.8CVSS 3.0 base score, v2 9.3
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
30References
17 Jun 2026Last modified by NVD

Description

The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/100853 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039363 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1042004
https://access.redhat.com/errata/RHSA-2017:3485
https://access.redhat.com/errata/RHSA-2018:0378
https://access.redhat.com/errata/RHSA-2018:0583
https://access.redhat.com/errata/RHSA-2018:0585
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://security.gentoo.org/glsa/201710-18
https://usn.ubuntu.com/3528-1/
https://usn.ubuntu.com/3685-1/
https://www.debian.org/security/2017/dsa-4031
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/ PatchVendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/ PatchVendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/webrick-basic-auth-escape-sequence-injection-cve-2017-10784/ Vendor Advisory
http://www.securityfocus.com/bid/100853 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039363 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1042004
https://access.redhat.com/errata/RHSA-2017:3485
https://access.redhat.com/errata/RHSA-2018:0378
https://access.redhat.com/errata/RHSA-2018:0583
https://access.redhat.com/errata/RHSA-2018:0585
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://security.gentoo.org/glsa/201710-18
https://usn.ubuntu.com/3528-1/
https://usn.ubuntu.com/3685-1/
https://www.debian.org/security/2017/dsa-4031
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/ PatchVendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/ PatchVendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/webrick-basic-auth-escape-sequence-injection-cve-2017-10784/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-10784), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.