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CVE-2021-32030

ASUS Routers Improper Authentication

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 99.4%
  1. Published6 May 2021
  2. Added to CISA KEV2 Jun 2025
  3. Remediation due23 Jun 2025
Actively exploited (CISA KEV)

ASUS Lyra Mini and ASUS GT-AC2900 devices contain an improper authentication vulnerability that allows an attacker to gain unauthorized access to the administrative interface. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

Added to KEV: 2 Jun 2025Federal remediation due: 23 Jun 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

ASUS Gt-ac2900 Firmware< 3.0.0.4.386.42643
ASUS Lyra Mini Firmware< 3.0.0.4.384.46630

Remediation

Fixed in
ASUS Gt-ac2900 Firmware≥ 3.0.0.4.386.42643
ASUS Lyra Mini Firmware≥ 3.0.0.4.384.46630

References

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Frequently asked

Is CVE-2021-32030 being actively exploited?

Yes. CVE-2021-32030 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2 Jun 2025.

How severe is CVE-2021-32030?

CVE-2021-32030 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.4% probability of exploitation.

Which products are affected by CVE-2021-32030?

Affected products include ASUS Gt-ac2900 Firmware, ASUS Lyra Mini Firmware.

How do I fix CVE-2021-32030?

Upgrade affected software to a fixed version, for example ASUS Gt-ac2900 Firmware 3.0.0.4.386.42643, ASUS Lyra Mini Firmware 3.0.0.4.384.46630 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-32030 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.