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Fencer Intel
high 8.8

CVE-2017-10784 in the critical feed json

WEBrick RCE Vulnerability

published 2017-09-19 9 y ago modified 2026-06-17 4 mo ago also GHSA-369m-2gv6-mw28 , EUVD-2022-2118

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
16.4%
EPSS 16.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

  • rubygems webrick 1.4.0
  • ruby2.0 Ubuntu 14.04 LTS 2.0.0.484-1ubuntu2.10
  • ruby2.3 Ubuntu 16.04 LTS 2.3.1-2~16.04.5
  • ruby1.9.1 Ubuntu 14.04 LTS 1.9.3.484-2ubuntu1.5

ubuntu advisories UBUNTU-CVE-2017-10784

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ruby4.0 hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-libs hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-bundled-gems hummingbird 1 4.0.0-33.3.hum1
  • ruby4.0-default-gems hummingbird 1 4.0.0-33.3.hum1
  • ruby3.3 hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-libs hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-bundled-gems hummingbird 1 3.3.10-23.1.hum1
  • ruby3.3-default-gems hummingbird 1 3.3.10-23.1.hum1

red hat advisories RHSA-2026:8838RHSA-2026:7305RHSA-2026:7307RHSA-2018:0583RHSA-2018:0585RHSA-2018:0378

  • ruby2.1 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 2.1.9-19.3.2
  • yast2-ruby-bindings SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 3.1.53-9.8.1

suse advisories SUSE-SU-2020:1570-1

  • ruby Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 2.4.2-r0
  • ruby Alpine 3.3 2.2.8-r0
  • ruby Alpine 3.5, Alpine 3.4 2.3.5-r0
  • ruby2.2 Alpine 3.6, Alpine 3.5 2.2.8-r0

alpine advisories ALPINE-CVE-2017-10784

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-10784 updated cvss 5.4

ruby: Escape sequence injection vulnerability in the Basic authentication of WEBrick

  • Red Hat Enterprise Linux 5 ruby Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk
    affected: no fix planned “Will not fix”
  • Red Hat Hardened Images ruby
    affected: no fix available
  • Red Hat Subscription Asset Manager ruby193-ruby
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) ruby 2.0.0.648-33.el7_4, rubygems 2.0.14.1-33.el7_4, ruby-irb 2.0.0.648-33.el7_4, rubygem-json 1.7.7-33.el7_4, rubygem-rdoc 4.0.0-33.el7_4, ruby-libs 2.0.0.648-33.el7_4, +3 more Red Hat Enterprise Linux Client Optional (v. 7) rubygem-rake 0.9.6-33.el7_4, ruby-tcltk 2.0.0.648-33.el7_4, rubygem-minitest 4.3.2-33.el7_4 Red Hat Enterprise Linux ComputeNode (v. 7) ruby 2.0.0.648-33.el7_4, rubygems 2.0.14.1-33.el7_4, ruby-irb 2.0.0.648-33.el7_4, rubygem-json 1.7.7-33.el7_4, rubygem-rdoc 4.0.0-33.el7_4, ruby-libs 2.0.0.648-33.el7_4, +3 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) rubygem-rake 0.9.6-33.el7_4, ruby-tcltk 2.0.0.648-33.el7_4, rubygem-minitest 4.3.2-33.el7_4 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) ruby 2.0.0.648-33.el7_4, rubygems 2.0.14.1-33.el7_4, ruby-irb 2.0.0.648-33.el7_4, rubygem-json 1.7.7-33.el7_4, rubygem-rdoc 4.0.0-33.el7_4, ruby-libs 2.0.0.648-33.el7_4, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) rubygem-rake 0.9.6-33.el7_4, ruby-tcltk 2.0.0.648-33.el7_4, rubygem-minitest 4.3.2-33.el7_4
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) ruby 2.0.0.648-33.el7_4, rubygems 2.0.14.1-33.el7_4, ruby-irb 2.0.0.648-33.el7_4, rubygem-json 1.7.7-33.el7_4, rubygem-rdoc 4.0.0-33.el7_4, ruby-libs 2.0.0.648-33.el7_4, +3 more Red Hat Enterprise Linux Server Optional (v. 7) rubygem-rake 0.9.6-33.el7_4, ruby-tcltk 2.0.0.648-33.el7_4, rubygem-minitest 4.3.2-33.el7_4 Red Hat Enterprise Linux Workstation (v. 7) ruby 2.0.0.648-33.el7_4, rubygems 2.0.14.1-33.el7_4, ruby-irb 2.0.0.648-33.el7_4, rubygem-json 1.7.7-33.el7_4, rubygem-rdoc 4.0.0-33.el7_4, ruby-libs 2.0.0.648-33.el7_4, +3 more Red Hat Enterprise Linux Workstation Optional (v. 7) rubygem-rake 0.9.6-33.el7_4, ruby-tcltk 2.0.0.648-33.el7_4, rubygem-minitest 4.3.2-33.el7_4
    fixed: vendor fix RHSA-2018:0378
  • Red Hat Hardened Images ruby3.4 3.4.8-31.1.hum1, ruby4.0 4.0.0-33.3.hum1, ruby3.3 3.3.10-23.1.hum1, ruby3.4-libs 3.4.8-31.1.hum1, ruby4.0-libs 4.0.0-33.3.hum1, ruby3.3-libs 3.3.10-23.1.hum1, +6 more
    fixed: vendor fix RHSA-2026:7305
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-ruby22-ruby 2.2.9-19.el6, rh-ruby23-ruby 2.3.6-67.el6, rh-ruby24-ruby 2.4.2-86.el6, rh-ruby22-ruby-irb 2.2.9-19.el6, rh-ruby23-ruby-irb 2.3.6-67.el6, rh-ruby24-ruby-irb 2.4.2-86.el6, +41 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby22-ruby 2.2.9-19.el7, rh-ruby23-ruby 2.3.6-67.el7, rh-ruby24-ruby 2.4.2-86.el7, rh-ruby22-ruby-irb 2.2.9-19.el7, rh-ruby23-ruby-irb 2.3.6-67.el7, rh-ruby24-ruby-irb 2.4.2-86.el7, +41 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) rh-ruby22-ruby 2.2.9-19.el6, rh-ruby23-ruby 2.3.6-67.el6, rh-ruby24-ruby 2.4.2-86.el6, rh-ruby22-ruby-irb 2.2.9-19.el6, rh-ruby23-ruby-irb 2.3.6-67.el6, rh-ruby24-ruby-irb 2.4.2-86.el6, +41 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.3) rh-ruby22-ruby 2.2.9-19.el7, rh-ruby23-ruby 2.3.6-67.el7, rh-ruby24-ruby 2.4.2-86.el7, rh-ruby22-ruby-irb 2.2.9-19.el7, rh-ruby23-ruby-irb 2.3.6-67.el7, rh-ruby24-ruby-irb 2.4.2-86.el7, +41 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-ruby22-ruby 2.2.9-19.el7, rh-ruby23-ruby 2.3.6-67.el7, rh-ruby24-ruby 2.4.2-86.el7, rh-ruby22-ruby-irb 2.2.9-19.el7, rh-ruby23-ruby-irb 2.3.6-67.el7, rh-ruby24-ruby-irb 2.4.2-86.el7, +41 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-ruby22-ruby 2.2.9-19.el6, rh-ruby23-ruby 2.3.6-67.el6, rh-ruby24-ruby 2.4.2-86.el6, rh-ruby22-ruby-irb 2.2.9-19.el6, rh-ruby23-ruby-irb 2.3.6-67.el6, rh-ruby24-ruby-irb 2.4.2-86.el6, +41 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby22-ruby 2.2.9-19.el7, rh-ruby23-ruby 2.3.6-67.el7, rh-ruby24-ruby 2.4.2-86.el7, rh-ruby22-ruby-irb 2.2.9-19.el7, rh-ruby23-ruby-irb 2.3.6-67.el7, rh-ruby24-ruby-irb 2.4.2-86.el7, +41 more
    fixed: vendor fix RHSA-2018:0583
  • Red Hat CloudForms Management Engine 5 ruby-200-ruby, rh-ruby22-ruby Red Hat Hardened Images rubygem3.3-rbs 3.4.0-23.1.hum1, rubygem3.3-rss 0.3.1-23.1.hum1, rubygem3.4-rbs 3.8.0-31.1.hum1, rubygem3.4-rss 0.3.1-31.1.hum1, rubygem4.0-rss 0.3.2-33.3.hum1, rubygem3.3-irb 1.13.1-23.1.hum1, +45 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

16.41% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C
GitHub 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
rubygems webrick
<1.4.0
1.4.0

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.