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Vulnerability record · CVE-2021-43702 · published 5 July 2022

CVE-2021-43702: Asus zenwifi xd4s firmware cross-site scripting vulnerability

Asus · Zenwifi Xd4s Firmware

ASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). The ASUS router admin panel does not sanitize the WiFI logs correctly, if an attacker was able to change the SSID of the router with a custom payload, they could achieve stored XSS on the device.

9.0 CVSS 3.1 Critical EPSS 0.98% · top 39.4% CWE-79 · Cross-site scripting
9.0CVSS 3.1 base score, v2 3.5
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
93Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

ASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). The ASUS router admin panel does not sanitize the WiFI logs correctly, if an attacker was able to change the SSID of the router with a custom payload, they could achieve stored XSS on the device.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

93 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.asus.com/uk/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC88U/ ProductVendor Advisory
https://www.kroll.com/en/insights/publications/cyber/cve-2021-43702-from-discovery-to-patch ExploitThird Party Advisory
https://www.asus.com/uk/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC88U/ ProductVendor Advisory
https://www.kroll.com/en/insights/publications/cyber/cve-2021-43702-from-discovery-to-patch ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43702), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.