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.
総合評価: CVE-2015-1855 は中リスク(53.3/100)。CVSS 深刻度は中。悪用される可能性が高い(EPSS 2.81%、85 パーセンタイル) 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置(高いほど相対的に深刻)を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ(新 − 旧) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 2.72% | 2.81% | +0.10% |
| 2 | 2025-12-28 | 2.38% | 2.72% | +0.34% |
| 3 | 2025-12-27 | — | 2.38% | — |
EPSS の全履歴 (全 23 件)
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2015-1855: 1 source package rows (trunk); 11 state rows across 3 repos (3.22-community, 3.23-community, edge-community); fixed 0, open 11. | https://security.alpinelinux.org/vuln/CVE-2015-1855 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2015-1855 |
suse
|
medium | CVE-2015-1855 severity moderate: SUSE including 65 source package names (4.0.0:libruby2_1-2_1-2.1.9-15.1, 4.0.0:ruby2.1-2.1.9-15.1, …), 499 product×package rows across 85 product lines (Container caasp/v4/velum, HPE Helion OpenStack 8, … (85 product lines)): Known Not Affected 349, Fixed 150. | https://www.suse.com/security/cve/CVE-2015-1855/ |
ubuntu
|
low | CVE-2015-1855 low priority: Ubuntu including 6 source packages (ruby1.8, ruby1.9.1, ruby2.0, ruby2.1, ruby2.2, ruby2.3), 60 status rows across 10 suites (lucid, precise, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 38, ignored 9, not-affected 5, needed 4, released 4. | https://ubuntu.com/security/CVE-2015-1855 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| ruby-lang | ruby | >= 2.1.0, < 2.1.6 | cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* |
| ruby-lang | ruby | >= 2.2.0, < 2.2.2 | cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:-:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p0:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p195:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p247:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p353:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p451:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p481:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p576:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p594:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p598:*:*:*:*:*:* |
| ruby-lang | ruby | 2.0.0 | cpe:2.3:a:ruby-lang:ruby:2.0.0:p643:*:*:*:*:*:* |
| ruby-lang | trunk | < 50292 | cpe:2.3:a:ruby-lang:trunk:*:*:*:*:*:*:*:* |
| debian | debian_linux | 7.0 | cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* |
| debian | debian_linux | 8.0 | cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| puppet | puppet_agent | 1.0.0 | cpe:2.3:a:puppet:puppet_agent:1.0.0:*:*:*:*:*:*:* |
| puppet | puppet_enterprise | >= 3.0.0, < 3.8.0 | cpe:2.3:a:puppet:puppet_enterprise:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://www.debian.org/security/2015/dsa-3245 | Third Party Advisory |
| http://www.debian.org/security/2015/dsa-3246 | Third Party Advisory |
| http://www.debian.org/security/2015/dsa-3247 | Third Party Advisory |
| https://bugs.ruby-lang.org/issues/9644 | Third Party Advisory |
| https://puppetlabs.com/security/cve/cve-2015-1855 | Third Party Advisory |
| https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ | Vendor Advisory |