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Vulnerability details: VCID-mv26-fzn6-vycf
Vulnerability ID VCID-mv26-fzn6-vycf
Aliases CVE-2017-17718
GHSA-m7p8-9w66-9frm
Summary No validation of hostname certificate Net-ldap does not validate the hostname certificate. Ruby is relying on OpenSSL, and one common mistake made by users of OpenSSL is to assume that OpenSSL will validate the hostname in the server's certificate. did not perform hostname validation. and up contain support for hostname validation, but they still require the user to call a few functions to set it up.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-295 Improper Certificate Validation
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 5.9 http://openwall.com/lists/oss-security/2017/12/17/10
generic_textual MODERATE http://openwall.com/lists/oss-security/2017/12/17/10
cvssv3 4.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-17718.json
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
epss 0.00172 https://api.first.org/data/v1/epss?cve=CVE-2017-17718
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-m7p8-9w66-9frm
cvssv3.1 5.9 https://github.com/ruby-ldap/ruby-net-ldap
generic_textual MODERATE https://github.com/ruby-ldap/ruby-net-ldap
cvssv3 5.9 https://github.com/ruby-ldap/ruby-net-ldap/issues/258
cvssv3.1 5.9 https://github.com/ruby-ldap/ruby-net-ldap/issues/258
generic_textual MODERATE https://github.com/ruby-ldap/ruby-net-ldap/issues/258
cvssv3.1 5.9 https://github.com/ruby-ldap/ruby-net-ldap/pull/279
generic_textual MODERATE https://github.com/ruby-ldap/ruby-net-ldap/pull/279
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2017-17718
cvssv3 5.9 https://nvd.nist.gov/vuln/detail/CVE-2017-17718
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2017-17718
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2017-17718
Reference id Reference type URL
http://openwall.com/lists/oss-security/2017/12/17/10
http://ruby-doc.org/stdlib-1.9.3/libdoc/openssl/rdoc/OpenSSL/SSL.html#method-c-verify_certificate_identity
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-17718.json
https://api.first.org/data/v1/epss?cve=CVE-2017-17718
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17718
https://github.com/ruby-ldap/ruby-net-ldap
https://github.com/ruby-ldap/ruby-net-ldap/issues/258
https://github.com/ruby-ldap/ruby-net-ldap/pull/279
https://nvd.nist.gov/vuln/detail/CVE-2017-17718
1527048 https://bugzilla.redhat.com/show_bug.cgi?id=1527048
884693 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884693
cpe:2.3:a:net-ldap_project:net-ldap:0.0.5:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.0.5:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.10.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.10.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.10.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.10.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.1.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.1.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.1.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.1.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.11:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.11:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.12.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.12.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.12.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.12.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.13.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.13.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.14.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.14.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.15.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.15.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.2.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.2.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.2.2:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.2.2:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.2:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.2:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.3.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.3.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.3.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.3.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.5.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.5.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.6.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.6.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.6.1:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.6.1:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.7.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.7.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.8.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.8.0:*:*:*:*:ruby:*:*
cpe:2.3:a:net-ldap_project:net-ldap:0.9.0:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:net-ldap_project:net-ldap:0.9.0:*:*:*:*:ruby:*:*
GHSA-m7p8-9w66-9frm https://github.com/advisories/GHSA-m7p8-9w66-9frm
RHSA-2020:1454 https://access.redhat.com/errata/RHSA-2020:1454
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at http://openwall.com/lists/oss-security/2017/12/17/10
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-17718.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/ruby-ldap/ruby-net-ldap
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/ruby-ldap/ruby-net-ldap/issues/258
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/ruby-ldap/ruby-net-ldap/pull/279
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-17718
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-17718
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-17718
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.38417
EPSS Score 0.00172
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:47:30.906999+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/net-ldap/CVE-2017-17718.yml 38.0.0