Vulnerability Details CVE-2021-3128
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.025
EPSS Ranking 84.4%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
Products affected by CVE-2021-3128
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cpe:2.3:h:asus:rt-ac1750_b1:-
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cpe:2.3:h:asus:rt-ac1900:-
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cpe:2.3:h:asus:rt-ac1900p:-
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cpe:2.3:h:asus:rt-ac1900u:-
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cpe:2.3:h:asus:rt-ac2900:-
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cpe:2.3:h:asus:rt-ac3100:-
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cpe:2.3:h:asus:rt-ac5300:-
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cpe:2.3:h:asus:rt-ac58u:-
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cpe:2.3:h:asus:rt-ac65u:-
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cpe:2.3:h:asus:rt-ac66u_b1:-
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cpe:2.3:h:asus:rt-ac68p:-
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cpe:2.3:h:asus:rt-ac68r:-
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cpe:2.3:h:asus:rt-ac68rw:-
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cpe:2.3:h:asus:rt-ac68u:-
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cpe:2.3:h:asus:rt-ac68w:-
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cpe:2.3:h:asus:rt-ac85u:-
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cpe:2.3:h:asus:rt-ac86u:-
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cpe:2.3:h:asus:rt-ac88u:-
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cpe:2.3:h:asus:rt-ax3000:-
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cpe:2.3:h:asus:rt-ax56u:-
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cpe:2.3:h:asus:rt-ax58u:-
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cpe:2.3:h:asus:rt-ax68u:-
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cpe:2.3:h:asus:rt-ax82u:-
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cpe:2.3:h:asus:rt-ax86u:-
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cpe:2.3:h:asus:rt-ax88u:-
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cpe:2.3:h:asus:zenwifi_ax_(xt8):-
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cpe:2.3:o:asus:rt-ac1750_b1_firmware:*
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cpe:2.3:o:asus:rt-ac1900_firmware:*
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cpe:2.3:o:asus:rt-ac1900_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.10000
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20252
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20253
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20433
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20490
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20585
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20630
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20632
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.20633
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.32738
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.32799
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.45149
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.45708
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.45713
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.45717
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.81049
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.385.81351
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cpe:2.3:o:asus:rt-ac1900p_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac1900u_firmware:*
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cpe:2.3:o:asus:rt-ac1900u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac2900_firmware:3.0.0.4.384.20648
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cpe:2.3:o:asus:rt-ac2900_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac3100_firmware:*
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cpe:2.3:o:asus:rt-ac3100_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.21140
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.32738
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.32799
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.45149
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.45717
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81219
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81622
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81625
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81792
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81844
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81902
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81930
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.81981
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.384.82072
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.386.43129
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.386.43576
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac5300_firmware:3.0.0.4.386.46065
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cpe:2.3:o:asus:rt-ac58u_firmware:3.0.0.4.380.8228
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cpe:2.3:o:asus:rt-ac58u_firmware:3.0.0.4.380.8347
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cpe:2.3:o:asus:rt-ac58u_firmware:3.0.0.4.380.8375
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cpe:2.3:o:asus:rt-ac58u_firmware:3.0.0.4.380.8457
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cpe:2.3:o:asus:rt-ac58u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac65u_firmware:*
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cpe:2.3:o:asus:rt-ac65u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac66u_b1_firmware:3.0.0.4.286_51665
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cpe:2.3:o:asus:rt-ac66u_b1_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac68p_firmware:*
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cpe:2.3:o:asus:rt-ac68p_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac68r_firmware:*
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cpe:2.3:o:asus:rt-ac68r_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac68rw_firmware:*
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.374.4755
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.374.5047
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.374_4561
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.374_4887
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.374_4983
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.376.3715
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.380.1031
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.32738
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.32799
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.45149
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.45708
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.45713
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.45717
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.81049
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.384.81351
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.10000
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20252
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20253
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20433
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20490
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20585
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20630
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20632
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.385.20633
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.40558
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.41634
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.43129
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.43137
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.45987
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.46065
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cpe:2.3:o:asus:rt-ac68u_firmware:3.0.0.4.386.48262
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cpe:2.3:o:asus:rt-ac68w_firmware:*
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cpe:2.3:o:asus:rt-ac68w_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac85u_firmware:*
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cpe:2.3:o:asus:rt-ac85u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac86u_firmware:3.0.0.4.384.20648
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cpe:2.3:o:asus:rt-ac86u_firmware:3.0.0.4.386.45956
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cpe:2.3:o:asus:rt-ac86u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac86u_firmware:3.0.0.4.386.51255
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cpe:2.3:o:asus:rt-ac86u_firmware:3.0.0.4_386_51529
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cpe:2.3:o:asus:rt-ac88u_firmware:*
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cpe:2.3:o:asus:rt-ac88u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ac88u_firmware:3.1.0.108
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cpe:2.3:o:asus:rt-ax3000_firmware:-
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.384_10177
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.45898
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.47029
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.48631
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.48908
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.386.49674
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.388.22237
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cpe:2.3:o:asus:rt-ax3000_firmware:3.0.0.4.388.22525
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cpe:2.3:o:asus:rt-ax55_firmware:-
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cpe:2.3:o:asus:rt-ax55_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax55_firmware:3.0.0.4.386.51598
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cpe:2.3:o:asus:rt-ax55_firmware:3.0.0.4.386_49559
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cpe:2.3:o:asus:rt-ax55_firmware:3.0.0.4.386_50460
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cpe:2.3:o:asus:rt-ax56u_firmware:-
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cpe:2.3:o:asus:rt-ax56u_firmware:3.0.0.4.386.44266
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cpe:2.3:o:asus:rt-ax56u_firmware:3.0.0.4.386.45898
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cpe:2.3:o:asus:rt-ax56u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax56u_firmware:3.0.0.4.386_49559
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cpe:2.3:o:asus:rt-ax58u_firmware:-
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cpe:2.3:o:asus:rt-ax58u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax58u_firmware:3.0.0.4.386_48908
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cpe:2.3:o:asus:rt-ax68u_firmware:-
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cpe:2.3:o:asus:rt-ax68u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax68u_firmware:3.0.0.4.386_49479
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cpe:2.3:o:asus:rt-ax82u_firmware:-
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cpe:2.3:o:asus:rt-ax82u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax82u_firmware:3.0.0.4.386_49380
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cpe:2.3:o:asus:rt-ax82u_firmware:3.0.0.4.386_49674-ge182230
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cpe:2.3:o:asus:rt-ax86u_firmware:-
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cpe:2.3:o:asus:rt-ax86u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax86u_firmware:3.0.0.4.386_49447
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cpe:2.3:o:asus:rt-ax88u_firmware:-
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.4730
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.4736
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.5247
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.5329
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.5640
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.5951
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.384.6210
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.42095
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.42819
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.42820
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.44266
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.45375
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.45898
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.45934
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.46061
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.46065
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.48631
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.386.49674
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.388.20499
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.388.20518
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.388.20558
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.388.22525
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cpe:2.3:o:asus:rt-ax88u_firmware:3.0.0.4.388.23748
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cpe:2.3:o:asus:zenwifi_ax_(xt8)_firmware:*