The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification
総合評価: CVE-2017-17688 は悪用リスクが高い（68.4/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 2.84%、86 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
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。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 2026-05-16 | 3.27% | 2.84% | -0.42% |
| 2 | 2026-04-01 | 2.84% | 3.27% | +0.42% |
| 3 | 2025-11-30 | — | 2.84% | — |
EPSS の全履歴 （全 20 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 | 3.0 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2017-17688 not yet assigned priority: Debian including 1 source packages (enigmail), 1 status rows across 1 suites (bullseye): resolved 1. | https://security-tracker.debian.org/tracker/CVE-2017-17688 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2017-17688 |
suse
|
medium | CVE-2017-17688 severity moderate: SUSE including 20 source package names (enigmail, enigmail-2.0.5-1.2, …), 98 product×package rows across 43 product lines (SUSE Enterprise Storage 7, SUSE Linux Enterprise Desktop 12 SP3, … (43 product lines)): Known Not Affected 90, Fixed 8. | https://www.suse.com/security/cve/CVE-2017-17688/ |
ubuntu
|
medium | CVE-2017-17688 medium priority: Ubuntu including 1 source packages (enigmail), 7 status rows across 7 suites (artful, bionic, cosmic, disco, trusty, upstream, xenial): not-affected 4, DNE 1, ignored 1, released 1. | https://ubuntu.com/security/CVE-2017-17688 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| apple | — | cpe:2.3:a:apple:mail:-:*:*:*:*:*:*:* | |
| apple | — | cpe:2.3:a:apple:mail:-:*:*:*:*:iphone_os:*:* | |
| bloop | airmail | — | cpe:2.3:a:bloop:airmail:-:*:*:*:*:*:*:* |
| emclient | emclient | — | cpe:2.3:a:emclient:emclient:-:*:*:*:*:*:*:* |
| flipdogsolutions | maildroid | — | cpe:2.3:a:flipdogsolutions:maildroid:-:*:*:*:*:*:*:* |
| freron | mailmate | — | cpe:2.3:a:freron:mailmate:-:*:*:*:*:*:*:* |
| horde | horde_imp | — | cpe:2.3:a:horde:horde_imp:-:*:*:*:*:*:*:* |
| microsoft | outlook | 2007 | cpe:2.3:a:microsoft:outlook:2007:*:*:*:*:*:*:* |
| mozilla | thunderbird | — | cpe:2.3:a:mozilla:thunderbird:-:*:*:*:*:*:*:* |
| postbox-inc | postbox | — | cpe:2.3:a:postbox-inc:postbox:-:*:*:*:*:*:*:* |
| r2mail2 | r2mail2 | — | cpe:2.3:a:r2mail2:r2mail2:-:*:*:*:*:*:*:* |
| roundcube | webmail | — | cpe:2.3:a:roundcube:webmail:-:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html | Third Party Advisory |
| http://www.securityfocus.com/bid/104162 | Third Party Advisory VDB Entry |
| http://www.securitytracker.com/id/1040904 | Third Party Advisory VDB Entry |
| https://efail.de | Exploit Mitigation Third Party Advisory |
| https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html | Third Party Advisory |
| https://news.ycombinator.com/item?id=17066419 | Issue Tracking Third Party Advisory |
| https://protonmail.com/blog/pgp-vulnerability-efail | Issue Tracking Third Party Advisory |
| https://twitter.com/matthew_d_green/status/995996706457243648 | Third Party Advisory |
| https://www.patreon.com/posts/cybersecurity-15-18814817 | Issue Tracking Third Party Advisory |
| https://www.synology.com/support/security/Synology_SA_18_22 | Third Party Advisory |