CVE-2015-1855

mediumpriority · track · 35EPSS 0.028 · 86 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

2.81% (86th) EPSS

CVSS 4.3 · medium

Is it mine?

15 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nsecondary · FSTEC (BDU) RU

v3.15.6mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-295US

exploits (1)

Public proof-of-concept and weaponised exploit code.

vpereira/CVE-2015-1855poc for CVE-2015-1855PoC · poc_in_github

affected products (15)

Products and version ranges known to be affected.

Ruby Ruby≤ and 2.2.x before 2.2.2enisa_euvdEU
Ruby Ruby≤ before 2.0.0 patchlevel 645enisa_euvdEU
Ruby Ruby≤ 2.1.x before 2.1.6enisa_euvdEU
Ruby Team Ruby2.0.0 → 2.0.0-p645fstec_bduRU
Ruby Team Ruby2.1.0 → 2.1.6fstec_bduRU
Ruby Team Ruby2.2.0 → 2.2.2fstec_bduRU
debian debian linux= 7.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
puppet puppet agent= 1.0.0nvdUScpe:2.3:a:puppet:puppet_agent:*:*:*:*:*:*:*:*
puppet puppet enterprise3.0.0 → 3.8.0nvdUScpe:2.3:a:puppet:puppet_enterprise:*:*:*:*:*:*:*:*
ruby-lang ruby= 2.0.0nvdUScpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
ruby-lang ruby2.1.0 → 2.1.6nvdUScpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
ruby-lang ruby2.2.0 → 2.2.2nvdUScpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
ruby-lang trunk< 50292nvdUScpe:2.3:a:ruby-lang:trunk:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2019-11-29modified 2026-06-17

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+25171 more

references (20)

External citations — patches, advisories, analysis.

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