NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method "none," and (3) the authentication server returns the "Auth-Wait" response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
総合評価: CVE-2025-53859 は低リスク（35.5/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.37%、29 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 | 0.06% | 0.37% | +0.32% |
| 2 | 2026-06-09 | 0.02% | 0.06% | +0.04% |
| 3 | 2026-01-18 | — | 0.02% | — |
EPSS の全履歴 （全 8 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 |
|---|---|---|---|---|---|---|
| 6.3 | 4.0 | MEDIUM |
|
— | — | [email protected] |
| 3.7 | 3.1 | LOW |
|
2.2 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
low | CVE-2025-53859: 1 source package rows (nginx); 3 state rows across 3 repos (3.22-main, 3.23-main, edge-main); fixed 3, open 0. | https://security.alpinelinux.org/vuln/CVE-2025-53859 |
debian
|
not yet assigned | CVE-2025-53859 not yet assigned priority: Debian including 1 source packages (nginx), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-53859 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2025-53859 |
suse
|
low | CVE-2025-53859 severity low: SUSE including 8 source package names (1.1.0-1.1:nginx-1.21.5-150600.10.12.1, 1.21.5-2.51:nginx-1.21.5-150600.10.12.1, …), 12 product×package rows across 7 product lines (Container private-registry/harbor-nginx, Container private-registry/harbor-portal, … (7 product lines)): Fixed 12. | https://www.suse.com/security/cve/CVE-2025-53859/ |
ubuntu
|
medium | CVE-2025-53859 medium priority: Ubuntu including 1 source packages (nginx), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): needs-triage 5, released 4. | https://ubuntu.com/security/CVE-2025-53859 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| f5 | nginx_plus | r30 | cpe:2.3:a:f5:nginx_plus:r30:-:*:*:*:*:*:* |
| f5 | nginx_plus | r31 | cpe:2.3:a:f5:nginx_plus:r31:-:*:*:*:*:*:* |
| f5 | nginx_plus | r32 | cpe:2.3:a:f5:nginx_plus:r32:-:*:*:*:*:*:* |
| f5 | nginx_plus | r32 | cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:* |
| f5 | nginx_plus | r32 | cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:* |
| f5 | nginx_plus | r33 | cpe:2.3:a:f5:nginx_plus:r33:-:*:*:*:*:*:* |
| f5 | nginx_plus | r33 | cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:* |
| f5 | nginx_plus | r33 | cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:* |
| f5 | nginx_plus | r34 | cpe:2.3:a:f5:nginx_plus:r34:-:*:*:*:*:*:* |
| f5 | nginx_plus | r34 | cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:* |
| f5 | nginx_open_source | >= 0.7.22, < 1.29.1 | cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* |