Cyber Posture

CVE-2026-2155

HighPublic PoCRCE

Published: 08 February 2026

Published
08 February 2026
Modified
11 February 2026
KEV Added
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Patch
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CVSS Score 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0056 68.2th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-2155 is a high-severity Command Injection (CWE-77) vulnerability in Dlink Dir-823X Firmware. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 31.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique.
Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

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 interface (/goform/set_dmz) directly enables remote exploitation of the device (T1190) and arbitrary Unix shell command execution (T1059.004).

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

NVD Description

A security flaw has been discovered in D-Link DIR-823X 250416. The affected element is the function sub_4208A0 of the file /goform/set_dmz of the component Configuration Handler. The manipulation of the argument dmz_host/dmz_enable results in os command injection. The attack can…

more

be executed remotely. The exploit has been released to the public and may be used for attacks.

Deeper analysisAI

CVE-2026-2155 is an OS command injection vulnerability (CWE-77, CWE-78) affecting the D-Link DIR-823X router with firmware version 250416. The issue lies in the sub_4208A0 function of the /goform/set_dmz file within the Configuration Handler component, where manipulation of the dmz_host or dmz_enable arguments triggers command injection.

The vulnerability is remotely exploitable over the network (AV:N) with low complexity (AC:L), but requires high privileges (PR:H) and no user interaction (UI:N), maintaining unchanged scope (S:U). It carries a CVSS v3.1 base score of 7.2 (High), enabling attackers to achieve high impacts on confidentiality, integrity, and availability through arbitrary OS command execution.

Advisories and additional details are documented in references such as https://github.com/master-abc/cve/issues/32, https://vuldb.com/?ctiid.344857, https://vuldb.com/?id.344857, https://vuldb.com/?submit.748236, and https://vuldb.com/?submit.750038. An exploit for this vulnerability has been publicly released and may be used in attacks.

Details

CWE(s)
CWE-77CWE-78

Affected Products

dlink
dir-823x firmware
250416

CVEs Like This One

CVE-2026-2175Same product: Dlink Dir-823X
CVE-2026-2210Same product: Dlink Dir-823X
CVE-2026-2081Same product: Dlink Dir-823X
CVE-2026-2157Same 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-2026-2142Same product: Dlink Dir-823X
CVE-2026-2129Same product: Dlink Dir-823X
CVE-2026-2120Same product: Dlink Dir-823X

References