CVE-2021-32030 (GCVE-0-2021-32030)

Vulnerability from cvelistv5 – Published: 2021-05-06 14:54 – Updated: 2025-10-21 23:25
VLAI CISA Shadowserver Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-06 03:55 UTC
CWE
  • n/a
  • CWE-287 - Improper Authentication
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2166 records in the last 180 days details
References
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a808b21c-06d8-4f71-895e-be9d66b73a9c

Vulnerability ID: CVE-2021-32030

Status: Confirmed

Status Updated: 2025-06-02 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-06-02
Asserted: 2025-06-02
Scope
Notes: ASUS Routers Improper Authentication Vulnerability | Affected: ASUS / Routers | Description: 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. | 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. | Due date: 2025-06-23 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/ ; https://www.asus.com/us/supportonly/rog%20rapture%20gt-ac2900/helpdesk_bios/; https://nvd.nist.gov/vuln/detail/CVE-2021-32030
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product Routers
Due Date 2025-06-23
Date Added 2025-06-02
Vendorproject ASUS
Vulnerabilityname ASUS Routers Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-11-04 13:36 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e46b6320-d86a-4792-a251-3e070d296714

Vulnerability ID: CVE-2021-32030

Status: Confirmed

Status Updated: 2026-11-08 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-11-08
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: ASUS / GT-AC2900 | Class: router | Severity: Critical (CVSS 9.8) | IoT: yes | In CISA KEV: yes | Honeypot connections on 2026-11-08: 378
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 2
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 2
Vendor ASUS
30D Avg 3
90D Avg 3
Product GT-AC2900
Cisa Kev yes
Connections 378
Observation Date 2026-11-08
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-11-10 01:02 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6a6ceb50-ea90-4ae1-9c6e-974d5a6ea71a

Vulnerability ID: CVE-2021-32030

Status: Confirmed

Status Updated: 2025-04-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-04-28
Asserted: 2025-04-28
Scope
Notes: KEVIntel entry: 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... | Affected: ASUS / GT-AC2900, Lyra Mini | CVSS: 9.8 (CRITICAL) | EPSS: 0.99351 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor ASUS
Product GT-AC2900, Lyra Mini
Added Date 2025-04-28T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.99351
Cvss Severity CRITICAL
Epss Percentile 0.99934
Used In Malware unknown
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.