CVE-2023-31889Public exploit

Administrative web UI hang via incomplete GET

Published Apr 29, 2024 · Updated Aug 2, 2024

Denial of service in ASUS RT-AC51U firmware 3.0.0.4.380.8591 and earlier allows local users to hang the administrative web UI. The single-threaded httpd accept loop waits indefinitely on an incomplete GET request, blocking it from accepting new administrative connections. Access to the router's LAN is required, and the documented effect is loss of web-administration availability rather than a device reboot.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in ASUS RT-AC51U firmware 3.0.0.4.380.8591 and earlier allows local users to hang the administrative web UI. The single-threaded httpd accept loop waits indefinitely on an incomplete GET request, blocking it from accepting new administrative connections. Access to the router's LAN is required, and the documented effect is loss of web-administration availability rather than a device reboot.

The record

CVE
CVE-2023-31889
Published
Apr 29, 2024
Updated
Aug 2, 2024
Vendor
ASUSTeK Computer Inc.
Product
ASUS Firmware
Classifications
CWE-400, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=*3.0.0.4.380.8591 <=3.0.0.4.380.8591

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

ASUSTeK Computer Inc. · ASUS Firmwareversion=*3.0.0.4.380.8591 <=3.0.0.4.380.8591

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

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Your stack

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