Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote user bypass login and reach the administrator interface on affected ASUS GT-AC2900 and Lyra Mini devices. Business risk is high because router administration controls network traffic, security settings, and availability. CISA KEV indicates known exploitation has occurred.
Executive priority
Treat this as urgent for any exposed affected router. A successful bypass could give an attacker administrative control of a network gateway. Patch or disable WAN administration immediately, and replace devices that are unsupported or cannot receive fixed firmware.
Technical view
CVE-2021-32030 is an authentication bypass in the ASUS administrator application, related to handle_request in router/httpd/httpd.c and auth_check in web_hook.o. An attacker-supplied null value can match a default null value in some situations, allowing unauthorized administrator access. CVSS is 9.8 critical.
Likely exposure
Exposure is most likely where affected ASUS GT-AC2900 or Lyra Mini router administration is reachable from WAN. GT-AC2900 is affected before 3.0.0.4.386.42643, and Lyra Mini before 3.0.0.4_384_46630. Unsupported Lyra Mini and earlier EOL versions are also affected.
Exploitation context
CISA lists CVE-2021-32030 in the Known Exploited Vulnerabilities catalog, supporting known exploitation. The provided sources do not describe campaign scale, targeting, or current exploit volume. The issue requires network reachability but no credentials or user interaction.
Researcher notes
The affected list in the bundled CVE metadata is generic, but the description names GT-AC2900 and Lyra Mini with version thresholds. Evidence supports authentication bypass and KEV status, but the bundle does not provide safe validation payloads, detailed exploit telemetry, or comprehensive model coverage.
Mitigation direction
- Update ASUS GT-AC2900 to 3.0.0.4.386.42643 or later.
- Update Lyra Mini to 3.0.0.4_384_46630 if available.
- Disable remote administration or remote access features from WAN.
- Replace unsupported or EOL Lyra Mini devices that cannot be updated.
- Check ASUS support guidance for model-specific firmware availability.
Validation and detection
- Inventory ASUS GT-AC2900 and Lyra Mini devices in use.
- Confirm each device firmware version against the affected version thresholds.
- Verify WAN remote access to the administrator interface is disabled.
- Prioritize any internet-reachable affected device for immediate remediation.
- Review configuration for unexpected administrator or remote-management changes.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-32030 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/CVE reference
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.mdCVE reference
- https://www.atredis.com/blog/2021/4/30/asus-authentication-bypassCVE reference
- https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.