CVE-2021-32030Known exploitationPublic exploitNetwork attack vector

Unauthenticated administrator access via null session token

Published May 6, 2021 · Updated Oct 21, 2025

Improper authentication in ASUS GT-AC2900 and Lyra Mini firmware allows remote attackers to access the administrator interface. The auth_check routine treats a null-prefixed asus_token as equal to the empty default IFTTT token and marks the request authenticated. Exploitation requires the internal-service user agent and an unset IFTTT token, which is the device's default state; exposure from the internet additionally requires WAN administration.

CVSS severity9.8
Critical
EPSS probability99.39%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in ASUS GT-AC2900 and Lyra Mini firmware allows remote attackers to access the administrator interface. The auth_check routine treats a null-prefixed asus_token as equal to the empty default IFTTT token and marks the request authenticated. Exploitation requires the internal-service user agent and an unset IFTTT token, which is the device's default state; exposure from the internet additionally requires WAN administration.

The record

CVE
CVE-2021-32030
Published
May 6, 2021
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 15, 2026. Gaps indicate unavailable data.
Sep 9, 2026Sep 15, 2026
View daily counts
Reporting dayUnique IPs
Sep 9, 2026Unavailable
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 20264
Sep 15, 20263
Latest reporting daySep 15, 2026
Latest daily unique IPs3
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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