CVE-2023-34358Public exploitNetwork attack vector

Service crash via malformed JSON request body

Published Jul 31, 2023 · Updated Oct 21, 2024

Out-of-bounds read in RT-AX88U firmware 3.0.0.4.388_22525-gd35b8fe and earlier allows remote attackers to crash httpd. The do_json_decode function in web.c passes a scalar JSON value parsed from an HTTP request body to object iteration, which dereferences absent key-value state. No authentication or user interaction is required, and repeated requests can keep the web service unavailable despite watchdog restarts.

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 RT-AX88U firmware 3.0.0.4.388_22525-gd35b8fe and earlier allows remote attackers to crash httpd. The do_json_decode function in web.c passes a scalar JSON value parsed from an HTTP request body to object iteration, which dereferences absent key-value state. No authentication or user interaction is required, and repeated requests can keep the web service unavailable despite watchdog restarts.

The record

CVE
CVE-2023-34358
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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