CVE-2023-34359Network attack vector

Unauthenticated HTTP service crash via JSON decoding

Published Jul 31, 2023 · Updated Oct 21, 2024

Out-of-bounds read in ASUS RT-AX88U 3.0.0.4.388_22525-gd35b8fe and earlier allows remote attackers to crash httpd. The do_json_decode() function in ej.c reads beyond a buffer while decoding a crafted HTTP request, terminating the web server process. No authentication is required, and the demonstrated consequence is interruption of the router's HTTP management service rather than device-wide shutdown.

CVSS severity7.5
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in ASUS RT-AX88U 3.0.0.4.388_22525-gd35b8fe and earlier allows remote attackers to crash httpd. The do_json_decode() function in ej.c reads beyond a buffer while decoding a crafted HTTP request, terminating the web server process. No authentication is required, and the demonstrated consequence is interruption of the router's HTTP management service rather than device-wide shutdown.

The record

CVE
CVE-2023-34359
Published
Jul 31, 2023
Updated
Oct 21, 2024
Vendor
ASUSTeK Computer Inc.
Product
RT-AX88U
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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 version<=3.0.0.4.388_22525-gd35b8fe
  2. Affected versionversion=0 <=3.0.0.4.388_22525-gd35b8fe

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ASUSTeK Computer Inc. · RT-AX88U<=3.0.0.4.388_22525-gd35b8fe; version=0 <=3.0.0.4.388_22525-gd35b8fe

Published CVSS scores

7.5TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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