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Rt Ax88u FirmwareOperating system · Asus

CVE-2023-34358

HIGH · 7.5 CVSS v3.1 Published 2023-07-31
Fix available
A fix is available. Upgrade to 3.0.0.4.388.23748 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
ASUS RT-AX88U's httpd is subject to an unauthenticated DoS condition. A remote attacker can send a specially crafted request to a device which contains a specific user agent, causing the httpd binary to crash during a string comparison performed within web.c, resulting in a DoS condition.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The ASUS RT-AX88U router's httpd web server contains an unauthenticated denial of service vulnerability. A remote attacker can send a specially crafted HTTP request containing a specific user agent string that triggers a crash during a string comparison operation in web.c, causing the httpd process to fail and rendering the web management interface unavailable.

MitigationApply the vendor firmware update from ASUS when available. As an interim measure, restrict access to the router's web interface (port 80/443) using firewall rules or ACLs to prevent unauthenticated external attackers from exploiting this vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Rt Ax88u FirmwareOperating system
Affected:< 3.0.0.4.388.23748

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm router model is ASUS RT-AX88U
    Log into the router web interface and check the device model in System > Device Info or similar status page. Alternatively, check the product label on the device itself.
    Affected if Device is not an ASUS RT-AX88U router - this vulnerability only affects this specific model.
  2. Check installed firmware version
    In the router web interface, navigate to Administration > Firmware Upgrade or System > Device Info to view the current firmware version number.
    Affected if Firmware version is less than 3.0.0.4.388.23748 (versions 3.0.0.4.388.x and earlier are affected).
  3. Verify httpd process is running
    Log into the router via SSH or telnet if enabled, then run 'ps | grep httpd' or check the router's system status page to confirm the httpd process is active.
    Affected if httpd process is not running - the crash from this vulnerability would cause the process to terminate.
  4. Test web management interface accessibility
    Attempt to access the router's web interface by entering the router's IP address in a web browser. Verify the login page loads normally.
    Affected if Web interface is unresponsive or returns an error - successful exploitation causes the httpd service to crash, rendering the interface unavailable.

A user is affected if they own an ASUS RT-AX88U router running firmware version lower than 3.0.0.4.388.23748, and the httpd process is either not running or the web interface is inaccessible due to crashes.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 3.0.0.4.388.23748 or later
Fixed in 3.0.0.4.388.23748
Interim mitigation

Apply the vendor firmware update from ASUS when available. As an interim measure, restrict access to the router's web interface (port 80/443) using firewall rules or ACLs to prevent unauthenticated external attackers from exploiting this vulnerability.

Recommended fix High confidence

ASUS RT-AX88U Firmware 3.0.0.4.388.23748 or later

  1. Access the ASUS RT-AX88U router web interface by entering the router's IP address in a web browser
  2. Log into the router administration panel with administrator credentials
  3. Navigate to the 'Administration' or 'Firmware Upgrade' section
  4. Select the option to upgrade firmware manually or check for automatic updates
  5. If manually upgrading, download the firmware version 3.0.0.4.388.23748 or later from the official ASUS support website (support.asus.com)
  6. Upload the firmware file and initiate the upgrade process
  7. Wait for the firmware to upload and install - do not power off the router during this process
  8. After the router reboots, verify the firmware version has been updated in the administration interface

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Rt Ax88u Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-34358 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data