---
title: "CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability"
url: https://erroneo.us/security/cve/CVE-2021-32030/
description: "CVE-2021-32030 (ASUS Routers): Exploited in the wild (CISA KEV). The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra…"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-05-06
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2021-32030"
kev: true
cvss: 9.8
epss: 0.99393
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run ASUS Routers. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-06-02, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-06-23 ; treat that as the outer limit, not the target.
- EPSS 99.4% , percentile 99.9: FIRST’s model estimates a 99.4% chance of exploitation activity in the next 30 days, higher than 99.9% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra Mini before 3.0.0.438446630 allows authentication bypass when processing remote input from an unauthenticated user, leading to unauthorized access to the administrator interface. This relates to handlerequest in router/httpd/httpd.c and authcheck in webhook.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.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-06-02; federal due date 2025-06-23. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.39% probability of exploitation activity in the next 30 days; percentile 99.9.

## Sources

- [Listed in CISA KEV notes (asus.com)](https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/)
- [Listed in CISA KEV notes (asus.com)](https://www.asus.com/us/supportonly/rog%20rapture%20gt-ac2900/helpdesk_bios/)
- [CVE.org record CVE-2021-32030](https://www.cve.org/CVERecord?id=CVE-2021-32030)
- [NVD entry CVE-2021-32030](https://nvd.nist.gov/vuln/detail/CVE-2021-32030)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030)
- [asus.com](https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/)
- [github.com](https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md)
- [atredis.com](https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass)

---
Source page: https://erroneo.us/security/cve/CVE-2021-32030/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt