The (1) dshield.conf, (2) mail-buffered.conf, (3) mynetwatchman.conf, and (4) mynetwatchman.conf actions in action.d/ in Fail2ban before 0.8.5 allows local users to write to arbitrary files via a symlink attack on temporary files with predictable names, as demonstrated by /tmp/fail2ban-mail.txt.
総合評価: CVE-2009-5023 は低リスク（28.1/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.34%、26 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
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。
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 | 0.05% | 0.34% | +0.29% |
| 2 | 2025-03-30 | 0.05% | 0.05% | -0.00% |
| 3 | 2025-03-29 | — | 0.05% | — |
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 |
|---|---|---|---|---|---|---|
| 4.7 | 2.0 | MEDIUM |
|
3.4 | 6.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2009-5023 low priority: Debian including 1 source packages (fail2ban), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2009-5023 |
gentoo
|
normal | CVE-2009-5023: 1 GLSA(s) (201406-03), 1 atom(s) (net-analyzer/fail2ban); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-5023 |
ubuntu
|
low | CVE-2009-5023 low priority: Ubuntu including 1 source packages (fail2ban), 10 status rows across 10 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, upstream): not-affected 5, ignored 4, released 1. | https://ubuntu.com/security/CVE-2009-5023 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| fail2ban | fail2ban | <= 0.8.4 | cpe:2.3:a:fail2ban:fail2ban:*:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.1.0 | cpe:2.3:a:fail2ban:fail2ban:0.1.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.1.1 | cpe:2.3:a:fail2ban:fail2ban:0.1.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.1.2 | cpe:2.3:a:fail2ban:fail2ban:0.1.2:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.3.0 | cpe:2.3:a:fail2ban:fail2ban:0.3.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.3.1 | cpe:2.3:a:fail2ban:fail2ban:0.3.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.4.0 | cpe:2.3:a:fail2ban:fail2ban:0.4.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.4.1 | cpe:2.3:a:fail2ban:fail2ban:0.4.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.0 | cpe:2.3:a:fail2ban:fail2ban:0.5.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.1 | cpe:2.3:a:fail2ban:fail2ban:0.5.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.2 | cpe:2.3:a:fail2ban:fail2ban:0.5.2:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.3 | cpe:2.3:a:fail2ban:fail2ban:0.5.3:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.4 | cpe:2.3:a:fail2ban:fail2ban:0.5.4:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.5.5 | cpe:2.3:a:fail2ban:fail2ban:0.5.5:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.6.0 | cpe:2.3:a:fail2ban:fail2ban:0.6.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.6.1 | cpe:2.3:a:fail2ban:fail2ban:0.6.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.0 | cpe:2.3:a:fail2ban:fail2ban:0.7.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.1 | cpe:2.3:a:fail2ban:fail2ban:0.7.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.2 | cpe:2.3:a:fail2ban:fail2ban:0.7.2:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.3 | cpe:2.3:a:fail2ban:fail2ban:0.7.3:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.4 | cpe:2.3:a:fail2ban:fail2ban:0.7.4:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.5 | cpe:2.3:a:fail2ban:fail2ban:0.7.5:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.6 | cpe:2.3:a:fail2ban:fail2ban:0.7.6:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.7 | cpe:2.3:a:fail2ban:fail2ban:0.7.7:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.8 | cpe:2.3:a:fail2ban:fail2ban:0.7.8:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.7.9 | cpe:2.3:a:fail2ban:fail2ban:0.7.9:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.8.0 | cpe:2.3:a:fail2ban:fail2ban:0.8.0:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.8.1 | cpe:2.3:a:fail2ban:fail2ban:0.8.1:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.8.2 | cpe:2.3:a:fail2ban:fail2ban:0.8.2:*:*:*:*:*:*:* |
| fail2ban | fail2ban | 0.8.3 | cpe:2.3:a:fail2ban:fail2ban:0.8.3:*:*:*:*:*:*:* |