# CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability

> CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-32030
Last updated: 2025-10-21T23:25:47Z

- Published: 2021-05-06 14:54 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 99.4%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2025-06-02, federal due date 2025-06-23, ransomware use: Unknown

## Description

The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra Mini before 3.0.0.4\_384\_46630 allows authentication bypass when processing remote input from an unauthenticated user, leading to unauthorized access to the administrator interface. This relates to handle\_request in router/httpd/httpd.c and auth\_check in web\_hook.o. An attacker-supplied value of '\\0' matches the device's default value of '\\0' in some situations. Note: All versions of Lyra Mini and earlier which are unsupported (End-of-Life, EOL) are also affected by this vulnerability, Consumers can mitigate this vulnerability by disabling the remote access features from WAN.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- ASUS: Routers

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-32030)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-32030)
- [https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md](https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md)
- [https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk\_BIOS/](https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/)
- [https://www.asus.com/us/supportonly/lyra%20mini/helpdesk\_bios/](https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/)
- [https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass](https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-32030 · Markdown: https://rewindex.com/cve/CVE-2021-32030.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-32030 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:27.666Z