CVE-2023-24331Public exploitNetwork attack vector

Root shell execution via unchecked urlAdd concatenation

Published Feb 21, 2024 · Updated Aug 29, 2024

Command injection in D-Link DIR-816 firmware 1.10CNB04 allows remote attackers to execute arbitrary commands through urlAdd. The websURLFilterAddDel handler moves urlAdd through intermediate buffers and appends it to a stack buffer with strcat without checking its length. Network access to the web interface is sufficient; no authentication or user interaction is required, and successful exploitation yields a root shell.

CVSS severity9.8
Critical
EPSS probability2.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in D-Link DIR-816 firmware 1.10CNB04 allows remote attackers to execute arbitrary commands through urlAdd. The websURLFilterAddDel handler moves urlAdd through intermediate buffers and appends it to a stack buffer with strcat without checking its length. Network access to the web interface is sufficient; no authentication or user interaction is required, and successful exploitation yields a root shell.

The record

CVE
CVE-2023-24331
Published
Feb 21, 2024
Updated
Aug 29, 2024
Vendor
D-Link
Product
DIR-816
Classifications
CWE-77, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 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=1.10cnb04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-816version=1.10cnb04

Published CVSS scores

9.8CISA-ADPCVSS: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.

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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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

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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