CVE-2024-39962Public exploitNetwork attack vector

Authenticated command execution via unfiltered NTP value

Published Jul 19, 2024 · Updated Aug 2, 2024

Command injection in D-Link DIR-823X firmware v21_D240126 allows remote authenticated users to execute commands through an HTTP request. The /goform/set_ntp CGI passes ntp_zone_val through uciSet into a formatted /sbin/uci command that sub_412B04 executes with system() without filtering metacharacters. Access requires valid management credentials, and injected commands run with administrator privileges on the router firmware filesystem.

CVSS severity9.8
Critical
EPSS probability2.06%
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-823X firmware v21_D240126 allows remote authenticated users to execute commands through an HTTP request. The /goform/set_ntp CGI passes ntp_zone_val through uciSet into a formatted /sbin/uci command that sub_412B04 executes with system() without filtering metacharacters. Access requires valid management credentials, and injected commands run with administrator privileges on the router firmware filesystem.

The record

CVE
CVE-2024-39962
Published
Jul 19, 2024
Updated
Aug 2, 2024
Vendor
D-Link
Product
DIR-823X
Classifications
CWE-94, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 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=v21_d240126

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

D-Link · DIR-823Xversion=v21_d240126

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

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.004Unix Shell

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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