CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• 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.

CISA’s summary

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.

Weakness type: CWE-287.

Product: ASUS Routers · Assigned by: mitre · Published: 2021-05-06

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: none (no login)
• User interaction: none
• Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• 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.

Timeline

• 2021-05-06 — CVE record published by mitre
• 2025-06-02 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2025-06-23 — CISA remediation deadline for US federal agencies
• 2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (asus.com) asus.com
2. Listed in CISA KEV notes (asus.com) asus.com

Vulnerability records

1. CVE.org record CVE-2021-32030 cve.org
2. NVD entry CVE-2021-32030 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

1. asus.com asus.com
2. github.com github.com
3. atredis.com atredis.com

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