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TI-2020-15633 Aliases CVE-2020-25613GHSA-gwfg-cqmg-cf8f

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through…

Priority LOW 39CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 8 fixed, 6 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

Why it matters now

EPSS 0.03818 90th percentileScored 2026-11-07
Fix Partial webrick (RubyGems): 1.6.1, 1.5.1, 1.4.4Red Hat: 11 advisoriesRed Hat: 8 fixed, 6 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—webrick (RubyGems)1.6.0 to before 1.6.11.6.1Patch availableGHSA-gwfg-cqmg-cf8f
—webrick (RubyGems)1.5.0 to before 1.5.11.5.1Patch availableGHSA-gwfg-cqmg-cf8f
—webrick (RubyGems)before 1.4.41.4.4Patch availableGHSA-gwfg-cqmg-cf8f
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • webrick (RubyGems) Vendor— Affected 1.6.0 to before 1.6.1 Fixed in 1.6.1 Patch available GHSA-gwfg-cqmg-cf8f
  • webrick (RubyGems) Vendor— Affected 1.5.0 to before 1.5.1 Fixed in 1.5.1 Patch available GHSA-gwfg-cqmg-cf8f
  • webrick (RubyGems) Vendor— Affected before 1.4.4 Fixed in 1.4.4 Patch available GHSA-gwfg-cqmg-cf8f

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*up to 2.5.8; 2.6.0 – 2.6.6; 2.7.0 – 2.7.1Vulnerableruby
cpe:2.3:a:ruby-lang:webrick:*:*:*:*:*:ruby:*:*up to 1.6.0Vulnerableruby
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*32VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* Versions up to 2.5.8; 2.6.0 – 2.6.6; 2.7.0 – 2.7.1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:webrick:*:*:*:*:*:ruby:*:* Versions up to 1.6.0 Vulnerable ·ruby
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

  • Fix · GHSA-gwfg-cqmg-cf8f webrick (RubyGems) Fixed in 1.6.1 Advisory →
  • Fix · GHSA-gwfg-cqmg-cf8f webrick (RubyGems) Fixed in 1.5.1 Advisory →
  • Fix · GHSA-gwfg-cqmg-cf8f webrick (RubyGems) Fixed in 1.4.4 Advisory →

Red Hat 11 advisories

  • RHSA-2026:8838 Released 2026-04-17 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby4.0-4.0.0-33.3.hum1@aarch64, ruby4.0-4.0.0-33.3.hum1@src, ruby4.0-4.0.0-33.3.hum1@x86_64 +10
  • RHSA-2026:7307 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.4-3.4.8-31.1.hum1@aarch64, ruby3.4-3.4.8-31.1.hum1@src, ruby3.4-3.4.8-31.1.hum1@x86_64 +10
  • RHSA-2026:7305 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.3-3.3.10-23.1.hum1@aarch64, ruby3.3-3.3.10-23.1.hum1@src, ruby3.3-3.3.10-23.1.hum1@x86_64 +10
Show 8 more Red Hat advisories
  • RHSA-2022:0582 Released 2022-02-21 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.2) ruby-2.6.9-107.module+el8.2.0+14086+86d863af.aarch64::ruby:2.6, ruby-2.6.9-107.module+el8.2.0+14086+86d863af.i686::ruby:2.6, ruby-2.6.9-107.module+el8.2.0+14086+86d863af.ppc64le::ruby:2.6 +47
  • RHSA-2022:0581 Released 2022-02-21 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.i686::ruby:2.6, ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.ppc64le::ruby:2.6, ruby-2.6.9-107.module+el8.1.0+14088+04cf326e.src::ruby:2.6 +47
  • RHSA-2021:2587 Released 2021-06-29 · Red Hat rating Moderate
    ruby:2.5 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.aarch64::ruby:2.5, ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.i686::ruby:2.5, ruby-2.5.9-107.module+el8.4.0+10822+fe4fffb1.ppc64le::ruby:2.5 +47
  • RHSA-2021:2584 Released 2021-06-29 · Red Hat rating Moderate
    ruby:2.7 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.7.3-136.module+el8.4.0+10728+4c884998.aarch64::ruby:2.7, ruby-2.7.3-136.module+el8.4.0+10728+4c884998.i686::ruby:2.7, ruby-2.7.3-136.module+el8.4.0+10728+4c884998.ppc64le::ruby:2.7 +47
  • RHSA-2021:2588 Released 2021-06-29 · Red Hat rating Moderate
    ruby:2.6 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.aarch64::ruby:2.6, ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.i686::ruby:2.6, ruby-2.6.7-107.module+el8.4.0+10830+bbd85cce.ppc64le::ruby:2.6 +47
  • RHSA-2021:2229 Released 2021-06-03 · Red Hat rating Moderate
    rh-ruby27-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby27-ruby-2.7.3-129.el7, rh-ruby27-ruby-devel-2.7.3-129.el7, rh-ruby27-ruby-doc-2.7.3-129.el7 +19
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby27-ruby-2.7.3-129.el7, rh-ruby27-ruby-devel-2.7.3-129.el7, rh-ruby27-ruby-doc-2.7.3-129.el7 +19
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby27-ruby-2.7.3-129.el7, rh-ruby27-ruby-devel-2.7.3-129.el7, rh-ruby27-ruby-doc-2.7.3-129.el7 +19
  • RHSA-2021:2230 Released 2021-06-03 · Red Hat rating Moderate
    rh-ruby26-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby26-ruby-2.6.7-119.el7, rh-ruby26-ruby-devel-2.6.7-119.el7, rh-ruby26-ruby-doc-2.6.7-119.el7 +18
  • RHSA-2021:2104 Released 2021-05-26 · Red Hat rating Moderate
    rh-ruby25-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby25-ruby-2.5.9-9.el7, rh-ruby25-ruby-devel-2.5.9-9.el7, rh-ruby25-ruby-doc-2.5.9-9.el7 +17

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
CloudForms Management Engine 5AffectedNo fix planned: Will not fix
Red Hat 3scale API Management Platform 2AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Hardened ImagesAffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:2584, RHSA-2021:2587, RHSA-2021:2588
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2022:0581
Red Hat Enterprise Linux AppStream EUS (v. 8.2)Fixed RHSA-2022:0582
Red Hat Hardened ImagesFixed RHSA-2026:7305, RHSA-2026:7307, RHSA-2026:8838
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:2104, RHSA-2021:2229, RHSA-2021:2230
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2021:2104
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2021:2104, RHSA-2021:2229, RHSA-2021:2230
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:2104, RHSA-2021:2229, RHSA-2021:2230
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-25613
  2. 2026-10-03 Alias added: GHSA-gwfg-cqmg-cf8f
  3. 2026-10-21 EPSS moved to the 90th–95th percentile
  4. 2026-10-25 EPSS moved to the 50th–90th percentile
  5. 2026-10-27 EPSS moved to the 90th–95th percentile
  6. 2026-11-02 Affected versions changed · Red Hat

References

Patch 1

Advisory 7

Other 12

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences