A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.
総合評価: CVE-2021-23017 は悪用リスクが高い（75.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 52.84%、99 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 |
|---|---|---|---|---|
| 50973 | exploit_db | edb | 2022-07-11 | 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 | 2026-06-15 | 73.17% | 52.84% | -20.33% |
| 2 | 2026-06-11 | 73.54% | 73.17% | -0.38% |
| 3 | 2026-05-22 | — | 73.54% | — |
EPSS の全履歴 （全 91 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 |
|---|---|---|---|---|---|---|
| 7.7 | 3.1 | HIGH |
|
2.2 | 5.5 | [email protected] |
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
critical | CVE-2021-23017: 1 source package rows (nginx); 32 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 12, open 20. | https://security.alpinelinux.org/vuln/CVE-2021-23017 |
debian
|
not yet assigned | CVE-2021-23017 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-2021-23017 |
gentoo
|
high | CVE-2021-23017: 1 GLSA(s) (202105-38), 1 atom(s) (www-servers/nginx); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-23017 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2021-23017 |
suse
|
high | CVE-2021-23017 severity important: SUSE including 29 source package names (1.19-3.1:nginx-1.19.8-3.3.1, nginx-1.16.1-3.15.1, …), 56 product×package rows across 28 product lines (Container suse/rmt-nginx, SUSE CaaS Platform 4.0, … (28 product lines)): Fixed 56. | https://www.suse.com/security/cve/CVE-2021-23017/ |
ubuntu
|
medium | CVE-2021-23017 medium priority: Ubuntu including 1 source packages (nginx), 9 status rows across 9 suites (bionic, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): released 8, needs-triage 1. | https://ubuntu.com/security/CVE-2021-23017 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| f5 | nginx | >= 0.6.18, < 1.20.1 | cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:* |
| openresty | openresty | < 1.19.3.2 | cpe:2.3:a:openresty:openresty:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 33 | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* |
| fedoraproject | fedora | 34 | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
| netapp | ontap_select_deploy_administration_utility | — | cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* |
| oracle | blockchain_platform | < 21.1.2 | cpe:2.3:a:oracle:blockchain_platform:*:*:*:*:*:*:*:* |
| oracle | communications_control_plane_monitor | 3.4 | cpe:2.3:a:oracle:communications_control_plane_monitor:3.4:*:*:*:*:*:*:* |
| oracle | communications_control_plane_monitor | 4.2 | cpe:2.3:a:oracle:communications_control_plane_monitor:4.2:*:*:*:*:*:*:* |
| oracle | communications_control_plane_monitor | 4.3 | cpe:2.3:a:oracle:communications_control_plane_monitor:4.3:*:*:*:*:*:*:* |
| oracle | communications_control_plane_monitor | 4.4 | cpe:2.3:a:oracle:communications_control_plane_monitor:4.4:*:*:*:*:*:*:* |
| oracle | communications_fraud_monitor | >= 3.4, <= 4.4 | cpe:2.3:a:oracle:communications_fraud_monitor:*:*:*:*:*:*:*:* |
| oracle | communications_operations_monitor | 3.4 | cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:* |
| oracle | communications_operations_monitor | 4.2 | cpe:2.3:a:oracle:communications_operations_monitor:4.2:*:*:*:*:*:*:* |
| oracle | communications_operations_monitor | 4.3 | cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:* |
| oracle | communications_operations_monitor | 4.4 | cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:* |
| oracle | communications_session_border_controller | 8.4 | cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:* |
| oracle | communications_session_border_controller | 9.0 | cpe:2.3:a:oracle:communications_session_border_controller:9.0:*:*:*:*:*:*:* |
| oracle | enterprise_communications_broker | 3.3.0 | cpe:2.3:a:oracle:enterprise_communications_broker:3.3.0:*:*:*:*:*:*:* |
| oracle | enterprise_session_border_controller | 8.4 | cpe:2.3:a:oracle:enterprise_session_border_controller:8.4:*:*:*:*:*:*:* |
| oracle | enterprise_session_border_controller | 9.0 | cpe:2.3:a:oracle:enterprise_session_border_controller:9.0:*:*:*:*:*:*:* |
| oracle | enterprise_telephony_fraud_monitor | 3.4 | cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:3.4:*:*:*:*:*:*:* |
| oracle | enterprise_telephony_fraud_monitor | 4.2 | cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.2:*:*:*:*:*:*:* |
| oracle | enterprise_telephony_fraud_monitor | 4.3 | cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.3:*:*:*:*:*:*:* |
| oracle | enterprise_telephony_fraud_monitor | 4.4 | cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.4:*:*:*:*:*:*:* |
| oracle | goldengate | < 21.4.0.0.0 | cpe:2.3:a:oracle:goldengate:*:*:*:*:*:*:*:* |