Dir 823x Firmware
CVE-2026-2142
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend authenticated HTTP POST request to /goform/set_qos
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ExploitInject OS command in QoS parameter
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ImpactExecute arbitrary command as root user
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Command injection prevention
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | D-Link DIR-823X router with firmware 250416 or earlier. Attacker must possess valid administrative credentials to access the /goform/set_qos endpoint. QoS configuration function must be enabled. |
| Impact | CVSS 7.2 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: High. User interaction: None. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to os command injection. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Remote code execution in D-Link DIR-823X firmware via command injection in the QoS configuration function allows unauthenticated attackers to execute arbitrary OS commands over the network. The vulnerability affects the /goform/set_qos endpoint and has public exploit code available, increasing the risk of active exploitation. No patch is currently available.
Earlier versions of this analysis (1)
A weakness has been identified in D-Link DIR-823X 250416. This vulnerability affects the function sub_420688 of the file /goform/set_qos. [CVSS 7.2 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-77 (Command Injection). Affects Dir-823X Firmware. A weakness has been identified in D-Link DIR-823X 250416. This vulnerability affects the function sub_420688 of the file /goform/set_qos. Executing a manipulation can lead to os command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
A weakness has been identified in D-Link DIR-823X 250416. This vulnerability affects the function sub_420688 of the file /goform/set_qos. Executing a manipulation can lead to os command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.
Executive ViewAI
A high-severity vulnerability (CVE-2026-2142) affects D-Link DIR-823X routers, with a public exploit already available. Organizations using this model face immediate risk of unauthorized access and network compromise, potentially exposing sensitive data and enabling lateral attacks into corporate infrastructure.
Disable QoS functionality if operationally feasible; restrict administrative access to affected routers via network ACLs and firewall rules; implement enhanced monitoring on affected devices for suspicious QoS configuration attempts; consider WAF rules to block requests to /goform/set_qos endpoints from untrusted sources; segment router management traffic to isolated administrative VLANs.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
OS command injection occurs when an application passes unsanitized user input directly into system shell commands.
Affected Products (CPE)CVE.org
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