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TI-2021-11807 Aliases CVE-2021-31810GHSA-wr95-679j-87v9

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1.

Priority LOW 32Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 10 fixed, 3 without a fix

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

Summary

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions).

Why it matters now

EPSS 0.0305 87th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 12 advisoriesRed Hat: 10 fixed, 3 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
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*up to 2.6.7; 2.7.0 – 2.7.3; 3.0.0 – 3.0.1Vulnerableruby
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34Running onFedoraproject
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:*before 9.2.6.1VulnerableOracle
  • cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* Versions up to 2.6.7; 2.7.0 – 2.7.3; 3.0.0 – 3.0.1 Vulnerable ·ruby
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Running on ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:* Versions before 9.2.6.1 Vulnerable ·Oracle

Remediation

Red Hat 12 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 9 more Red Hat advisories
  • RHSA-2022:0708 Released 2022-02-28 · Red Hat rating Important
    rh-ruby26-ruby security, bug fix, and enhancement update
    • Red Hat Software Collections for RHEL Workstation(v. 7) rh-ruby26-ruby-2.6.9-120.el7, rh-ruby26-ruby-devel-2.6.9-120.el7, rh-ruby26-ruby-doc-2.6.9-120.el7 +18
    • Red Hat Software Collections for RHEL(v. 7) rh-ruby26-ruby-2.6.9-120.el7, rh-ruby26-ruby-devel-2.6.9-120.el7, rh-ruby26-ruby-doc-2.6.9-120.el7 +18
  • RHSA-2022:0672 Released 2022-02-24 · Red Hat rating Moderate
    ruby:2.5 security update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.5.9-109.module+el8.5.0+14275+d9c243ca.aarch64::ruby:2.5, ruby-2.5.9-109.module+el8.5.0+14275+d9c243ca.i686::ruby:2.5, ruby-2.5.9-109.module+el8.5.0+14275+d9c243ca.ppc64le::ruby:2.5 +47
  • 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-2022:0544 Released 2022-02-16 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) ruby-2.6.9-108.module+el8.4.0+14070+b3717926.aarch64::ruby:2.6, ruby-2.6.9-108.module+el8.4.0+14070+b3717926.i686::ruby:2.6, ruby-2.6.9-108.module+el8.4.0+14070+b3717926.ppc64le::ruby:2.6 +47
  • RHSA-2022:0543 Released 2022-02-16 · Red Hat rating Important
    ruby:2.6 security update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.6.9-108.module+el8.5.0+13719+08a8ba32.aarch64::ruby:2.6, ruby-2.6.9-108.module+el8.5.0+13719+08a8ba32.i686::ruby:2.6, ruby-2.6.9-108.module+el8.5.0+13719+08a8ba32.ppc64le::ruby:2.6 +47
  • RHSA-2021:3982 Released 2021-10-25 · Red Hat rating Important
    rh-ruby30-ruby security update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby30-ruby-3.0.2-148.el7, rh-ruby30-ruby-default-gems-3.0.2-148.el7, rh-ruby30-ruby-devel-3.0.2-148.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby30-ruby-3.0.2-148.el7, rh-ruby30-ruby-default-gems-3.0.2-148.el7, rh-ruby30-ruby-devel-3.0.2-148.el7 +18
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby30-ruby-3.0.2-148.el7, rh-ruby30-ruby-default-gems-3.0.2-148.el7, rh-ruby30-ruby-devel-3.0.2-148.el7 +18
  • RHSA-2021:3559 Released 2021-09-20 · Red Hat rating Important
    rh-ruby27-ruby security update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby27-ruby-2.7.4-130.el7, rh-ruby27-ruby-devel-2.7.4-130.el7, rh-ruby27-ruby-doc-2.7.4-130.el7 +19
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-ruby27-ruby-2.7.4-130.el7, rh-ruby27-ruby-devel-2.7.4-130.el7, rh-ruby27-ruby-doc-2.7.4-130.el7 +19
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby27-ruby-2.7.4-130.el7, rh-ruby27-ruby-devel-2.7.4-130.el7, rh-ruby27-ruby-doc-2.7.4-130.el7 +19
  • RHSA-2021:3020 Released 2021-08-05 · Red Hat rating Important
    ruby:2.7 security update
    • Red Hat Enterprise Linux AppStream (v. 8) ruby-2.7.4-137.module+el8.4.0+12025+f744ca41.aarch64::ruby:2.7, ruby-2.7.4-137.module+el8.4.0+12025+f744ca41.i686::ruby:2.7, ruby-2.7.4-137.module+el8.4.0+12025+f744ca41.ppc64le::ruby:2.7 +47

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Hardened ImagesAffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:3020, RHSA-2022:0543, RHSA-2022:0672
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 Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2022:0544
Red Hat Hardened ImagesFixed RHSA-2026:7305, RHSA-2026:7307, RHSA-2026:8838
Red Hat Software Collections for RHEL Workstation(v. 7)Fixed RHSA-2022:0708
Red Hat Software Collections for RHEL(v. 7)Fixed RHSA-2022:0708
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:3559, RHSA-2021:3982
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2021:3559, RHSA-2021:3982
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:3559, RHSA-2021:3982
Not affected: 2 products
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31810
  2. 2026-10-03 Alias added: GHSA-wr95-679j-87v9
  3. 2026-11-07 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

Advisory 5

Other 1

Sources

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