In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware < 3.0.0.4.386.42095 or < 9.0.0.4.386.41994, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.
総合評価: CVE-2021-3128 は中リスク（57.7/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 2.18%、80 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 | 2026-06-15 | 2.48% | 2.18% | -0.30% |
| 2 | 2025-04-15 | 2.33% | 2.48% | +0.15% |
| 3 | 2025-03-30 | — | 2.33% | — |
EPSS の全履歴 （全 18 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 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| asus | zenwifi_ax_\(xt8\)_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:zenwifi_ax_\(xt8\)_firmware:*:*:*:*:*:*:*:* |
| asus | zenwifi_ax_\(xt8\)_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:zenwifi_ax_\(xt8\)_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax3000_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax3000_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax3000_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax3000_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax55_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax55_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax55_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax55_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax56u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax56u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax56u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax56u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax58u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax58u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax58u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax58u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax68u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax68u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax68u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax68u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax82u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax82u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax82u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax82u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax86u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax86u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax86u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax86u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax88u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ax88u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ax88u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ax88u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac66u_b1_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac66u_b1_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac66u_b1_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac66u_b1_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1750_b1_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac1750_b1_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1750_b1_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac1750_b1_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac1900_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac1900_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900p_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac1900p_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900p_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac1900p_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac1900u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac1900u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac1900u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac2900_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac2900_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac2900_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac2900_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac3100_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac3100_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac3100_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac3100_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac5300_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac5300_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac5300_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac5300_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac58u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac58u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac58u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac58u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac65u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac65u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac65u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac65u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68p_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac68p_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68p_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac68p_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68r_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac68r_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68r_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac68r_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68rw_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac68rw_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68rw_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac68rw_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac68u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac68u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68w_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac68w_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac68w_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac68w_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac85u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac85u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac85u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac85u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac86u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac86u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac86u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac86u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac88u_firmware | < 3.0.0.4.386.42095 | cpe:2.3:o:asus:rt-ac88u_firmware:*:*:*:*:*:*:*:* |
| asus | rt-ac88u_firmware | < 9.0.0.4.386.41994 | cpe:2.3:o:asus:rt-ac88u_firmware:*:*:*:*:*:*:*:* |