CVE-2026-2155Public exploitNetwork attack vector

Authenticated command execution via newline filter bypass

Published Feb 8, 2026 · Updated Feb 8, 2026

OS command injection in D-Link DIR-823X firmware 250416 allows remote authenticated users to execute arbitrary root commands. The set_dmz handler passes dmz_host or dmz_enable into a shell-backed UCI command after a blacklist omits newline characters, letting input terminate the configuration command and start another command. Administrative web-interface credentials are required, and successful exploitation runs commands as root while restarting the firewall service.

CVSS severity7.2
High
EPSS probability3.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in D-Link DIR-823X firmware 250416 allows remote authenticated users to execute arbitrary root commands. The set_dmz handler passes dmz_host or dmz_enable into a shell-backed UCI command after a blacklist omits newline characters, letting input terminate the configuration command and start another command. Administrative web-interface credentials are required, and successful exploitation runs commands as root while restarting the firewall service.

The record

CVE
CVE-2026-2155
Published
Feb 8, 2026
Updated
Feb 8, 2026
Vendor
D-Link
Product
DIR-823X
Classifications
CWE-77, CWE-78, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 2026Record 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=250416

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

D-Link · DIR-823Xversion=250416

Published CVSS scores

8.3VulDBAV:N/AC:L/Au:M/C:C/I:C/A:C
7.3VulDBCVSS: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
7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command 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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