ruby: OpenSSL extension hostname matching implementation violates RFC 6125
Published Nov 29, 2019
5.9
MEDIUMCVSS 3.1
EPSS 2.81%
Description
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.
Affected products
-
- Version 2.1.x before 2.1.6StatusaffectedConstraints-
- Version and 2.2.x before 2.2.2StatusaffectedConstraints-
- Version before 2.0.0 patchlevel 645StatusaffectedConstraints-
- Version
Configuration 1
- ≥ 2.1.0 · < 2.1.6
- ≥ 2.2.0 · < 2.2.2
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.0
- < 50292
Configuration 2
- 7.0
- 8.0
- 9.0
Configuration 3
- 1.0.0
- ≥ 3.0.0 · < 3.8.0
No data.
CloudForms Management Engine 5
ruby193-ruby
Affected
Red Hat Enterprise Linux 5
ruby
Will not fix
Red Hat Enterprise Linux 6
ruby
Will not fix
Red Hat Enterprise Linux 7
ruby
Will not fix
Red Hat OpenStack Platform 4
ruby193-ruby
Will not fix
Red Hat Software Collections
rh-ruby22-ruby
Not affected
Red Hat Software Collections
ruby193-ruby
Will not fix
Red Hat Software Collections
ruby200-ruby
Will not fix
Red Hat Subscription Asset Manager
ruby193-ruby
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| CloudForms Management Engine 5 | ruby193-ruby | Affected | n/a |
| Red Hat Enterprise Linux 5 | ruby | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | ruby | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | ruby | Will not fix | n/a |
| Red Hat OpenStack Platform 4 | ruby193-ruby | Will not fix | n/a |
| Red Hat Software Collections | rh-ruby22-ruby | Not affected | n/a |
| Red Hat Software Collections | ruby193-ruby | Will not fix | n/a |
| Red Hat Software Collections | ruby200-ruby | Will not fix | n/a |
| Red Hat Subscription Asset Manager | ruby193-ruby | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.81% (0.02815) | 86.05th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.81% (0.02815) | 84.65th | v5 (v2026.06.15) |
| Aug 19, 2025 | 2.38% (0.02378) | 84.34th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.03% (0.01034) | 75.37th | v4 (v2025.03.14) |
| Mar 29, 2025 | 21.08% (0.21076) | 92.90th | v4 (v2025.03.14) |
| Mar 28, 2025 | 1.03% (0.01034) | 75.37th | v4 (v2025.03.14) |
| Mar 27, 2025 | 21.08% (0.21076) | 94.84th | v4 (v2025.03.14) |
| Mar 20, 2025 | 7.38% (0.07376) | 90.96th | v4 (v2025.03.14) |
| Mar 19, 2025 | 21.08% (0.21076) | 94.94th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.38% (0.07376) | 91.05th | v4 (v2025.03.14) |
| Dec 17, 2024 | 4.08% (0.04083) | 92.03th | v3 (v2023.03.01) |
| Dec 12, 2024 | 2.58% (0.02578) | 90.64th | v3 (v2023.03.01) |
| Mar 24, 2024 | 2.80% (0.02800) | 90.40th | v3 (v2023.03.01) |
| Nov 5, 2023 | 2.02% (0.02020) | 87.68th | v3 (v2023.03.01) |
| Oct 20, 2023 | 1.77% (0.01774) | 86.63th | v3 (v2023.03.01) |
| Oct 3, 2023 | 1.85% (0.01846) | 86.93th | v3 (v2023.03.01) |
| Sep 18, 2023 | 2.10% (0.02096) | 87.78th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.76% (0.01762) | 86.02th | v3 (v2023.03.01) |
| Mar 6, 2023 | 8.93% (0.08934) | 93.99th | v2 (v2022.01.01) |
| Apr 1, 2022 | 8.93% (0.08934) | 93.45th | v2 (v2022.01.01) |
| Feb 4, 2022 | 8.93% (0.08934) | 82.99th | v2 (v2022.01.01) |
References (10)
- http://www.debian.org/security/2015/dsa-3245 x_refsource_MISCThird Party Advisory
- http://www.debian.org/security/2015/dsa-3246 x_refsource_MISCThird Party Advisory
- http://www.debian.org/security/2015/dsa-3247 x_refsource_MISCThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-1855 Vendor Advisory
- https://bugs.ruby-lang.org/issues/9644 x_refsource_MISCThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1209981 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-1855
- https://puppetlabs.com/security/cve/cve-2015-1855 x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2015-1855
- https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2015/dsa-3245 | x_refsource_MISCThird Party Advisory | |
| http://www.debian.org/security/2015/dsa-3246 | x_refsource_MISCThird Party Advisory | |
| http://www.debian.org/security/2015/dsa-3247 | x_refsource_MISCThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2015-1855 | Vendor Advisory | |
| https://bugs.ruby-lang.org/issues/9644 | x_refsource_MISCThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1209981 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-1855 | ||
| https://puppetlabs.com/security/cve/cve-2015-1855 | x_refsource_MISCThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2015-1855 | ||
| https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.