The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
総合評価: CVE-2011-1926 は中リスク（46.4/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 4.87%、89 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 | 2025-03-30 | 9.95% | 4.87% | -5.09% |
| 2 | 2025-03-29 | 4.87% | 9.95% | +5.09% |
| 3 | 2025-03-25 | — | 4.87% | — |
EPSS の全履歴 （全 7 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 |
|---|---|---|---|---|---|---|
| 5.1 | 2.0 | MEDIUM |
|
4.9 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2011-1926 |
ubuntu
|
high | CVE-2011-1926 high priority: Ubuntu including 2 source packages (cyrus-imapd-2.2, cyrus-imapd-2.4), 20 status rows across 10 suites (dapper, hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, upstream): DNE 8, ignored 4, not-affected 4, released 4. | https://ubuntu.com/security/CVE-2011-1926 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| cmu | cyrus_imap_server | <= 2.4.6 | cpe:2.3:a:cmu:cyrus_imap_server:*:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.0.17 | cpe:2.3:a:cmu:cyrus_imap_server:2.0.17:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.1.16 | cpe:2.3:a:cmu:cyrus_imap_server:2.1.16:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.1.17 | cpe:2.3:a:cmu:cyrus_imap_server:2.1.17:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.1.18 | cpe:2.3:a:cmu:cyrus_imap_server:2.1.18:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.8 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.8:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.9 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.9:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.10 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.10:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.11 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.11:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.12 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.12:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.13 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.13:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.2.13p1 | cpe:2.3:a:cmu:cyrus_imap_server:2.2.13p1:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.0 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.0:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.1 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.1:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.2 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.2:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.3 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.3:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.4 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.4:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.5 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.5:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.6 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.6:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.7 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.7:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.8 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.8:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.9 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.9:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.10 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.10:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.11 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.11:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.12 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.12:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.13 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.13:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.14 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.14:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.15 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.15:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.3.16 | cpe:2.3:a:cmu:cyrus_imap_server:2.3.16:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.0 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.0:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.1 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.1:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.2 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.2:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.3 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.3:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.4 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.4:*:*:*:*:*:*:* |
| cmu | cyrus_imap_server | 2.4.5 | cpe:2.3:a:cmu:cyrus_imap_server:2.4.5:*:*:*:*:*:*:* |