CVE-2021-32030
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.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? No. Authentication bypass is a flaw in the application's logic. The attack requests look like normal traffic, so a WAF has nothing to match on.
Also consider: patch · add auth middleware
Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2021-32030 being exploited?
Yes. CVE-2021-32030 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2021-32030?
CVE-2021-32030 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2021-32030?
Yes. A fix has been recorded for CVE-2021-32030. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2021-32030 affect?
CVE-2021-32030 affects asus:lyra_mini_firmware, asus:gt-ac2900_firmware. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
public exploits
Detection templates only, no public exploit found: 1 Nuclei template
- ASUS GT-AC2900 - Authentication Bypass · detection template · critical
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- total
Assessed by CISA 6 Jun 2025 (SSVC 2.0.3).
timeline
- 6 May 2021Published
- 2 Jun 2025Added to CISA KEV (exploited in the wild) · 1,487 days (about 4 years) later
- 6 Jun 2025CISA SSVC assessment: exploitation active · 4 days later
- 23 Jun 2025CISA remediation due date (US federal agencies) · 17 days later
- 21 Oct 2025CVE record last updated · 121 days (about 4 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 377 days (about 1 year) later
- Linkasus.com /Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS
- Linkgithub.com /atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
- Linkatredis.com /blog/2021/4/30/asus-authentication-bypass
- Linkasus.com /us/supportonly/lyra%20mini/helpdesk_bios/
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.