Cyber Resilience

CVE-2026-2142

HighPublic PoCRCE

Published: 08 February 2026

Published
08 February 2026
Modified
10 February 2026
KEV Added
—
Patch
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CVSS Score v4 7.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0013 32.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-2142 is a high-severity Command Injection (CWE-77) vulnerability in Dlink Dir-823X Firmware. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 32.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-2142 is an OS command injection vulnerability (CWE-77, CWE-78) affecting the D-Link DIR-823X router on firmware version 250416. The weakness is located in the sub_420688 function of the /goform/set_qos file, where manipulations enable command injection.

The vulnerability is remotely exploitable over the network with low attack complexity and no user interaction required, but it demands high privileges from the attacker. Successful exploitation grants high impacts across confidentiality, integrity, and availability, as reflected in its CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H), potentially allowing full system compromise.

VulDB advisories document the issue and note that a public exploit is available, increasing the risk of attacks. References point to a GitHub issue and the D-Link website for additional details on potential mitigations or patches.

EU & UK References

Vulnerability details

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…

more

to the public and could be used for attacks.

CWE(s)
CWE-77CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

OS command injection in public-facing router web form (/goform/set_qos) directly enables T1190 exploitation and arbitrary Unix shell command execution (T1059.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-2210Same product: Dlink Dir-823X
CVE-2026-2157Same product: Dlink Dir-823X
CVE-2026-2129Same product: Dlink Dir-823X
CVE-2026-2143Same product: Dlink Dir-823X
CVE-2026-2084Same product: Dlink Dir-823X
CVE-2026-2063Same product: Dlink Dir-823X
CVE-2026-2175Same product: Dlink Dir-823X
CVE-2026-2155Same product: Dlink Dir-823X
CVE-2026-2081Same product: Dlink Dir-823X
CVE-2025-29635Same product: Dlink Dir-823X

Affected Assets

dlink
dir-823x firmware
250416

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly blocks the command injection in /goform/set_qos by validating and sanitizing untrusted input before it reaches sub_420688.

SI-2 Flaw Remediation good match
prevent

Requires prompt application of vendor patches or firmware updates that eliminate the publicly disclosed OS command injection flaw.

AC-6 Least Privilege partial match
prevent

Limits the high-privilege account needed for remote exploitation, reducing the attack surface and potential impact on the DIR-823X.

References