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Fencer Intel
medium 5.9

CVE-2015-1855 json

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does n…

published 2019-11-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2015-1964

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

Patch / fix

  • ruby-lang ruby 2.1.6, 2.2.2
  • ruby-lang trunk 50292
  • puppet puppet_enterprise 3.8.0
  • ruby2.0 Ubuntu 14.04 LTS 2.0.0.484-1ubuntu2.4
  • ruby1.9.1 Ubuntu 14.04 LTS 1.9.3.484-2ubuntu1.3

ubuntu advisories UBUNTU-CVE-2015-1855

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

  • ruby2.1 SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +6 more 2.1.9-15.1
  • ruby WebYast 1.3, Studio Onsite 1.3, SLES for SAP 11 SP4 +3 more 1.8.7.p357-0.9.19.1
  • ruby19 Studio Onsite 1.3 1.9.3.p392-0.23.1

suse advisories SUSE-SU-2017:1067-1SUSE-SU-2017:0948-1SUSE-SU-2015:1889-1

  • ruby2.3 openSUSE Tumbleweed 2.3.1-1.6
  • ruby2.2 openSUSE Tumbleweed 2.2.5-1.5

opensuse advisories openSUSE-SU-2024:10090-1openSUSE-SU-2024:10481-1

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-2015-1855 updated cvss 4.0

ruby: OpenSSL extension hostname matching implementation violates RFC 6125

  • Red Hat CloudForms Management Engine 5 ruby193-ruby
    affected: no fix available
  • Red Hat Enterprise Linux 5 ruby Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk Red Hat Enterprise Linux 7 ruby, ruby-irb, rubygems, ruby-libs, ruby-tcltk, rubygem-json, +6 more Red Hat OpenStack Platform 4 ruby193-ruby Red Hat Software Collections ruby193-ruby, ruby200-ruby, ruby193-ruby-irb, ruby193-rubygems, ruby200-ruby-irb, ruby200-rubygems, +17 more
    affected: no fix planned “Will not fix”
  • Red Hat Subscription Asset Manager ruby193-ruby
    affected: no fix available
  • Red Hat Software Collections rh-ruby22-ruby, rh-ruby22-ruby-irb, rh-ruby22-rubygems, rh-ruby22-ruby-libs, rh-ruby22-ruby-tcltk, rh-ruby22-rubygem-json, +8 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

2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Ruby Ruby

Classification

Weakness
  • CWE-20 Improper Input Validation

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.