CVE-2026-1125VulnerabilityPublished 18 Jan 2026Updated 23 Feb 2026

CVE-2026-1125: D-Link DIR-823X · Command Injection

Affects D-Link DIR-823XSource CVE Database V5

Not known to be exploited · 15% EPSS · CVSS 6.9 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 15.7% chance of exploitation in 30 days – higher than 96% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
D-LinkDIR-823X	Affected =250416	Fixed in–

AI-suggested

Given the lack of an official patch, organizations should implement immediate compensating controls. First, restrict network access to the router’s management interface by limiting it to trusted IP addresses or disabling remote management entirely. Employ network segmentation to isolate vulnerable devices from critical systems. Monitor network traffic for unusual activity indicative of exploitation attempts, such as unexpected command execution or outbound connections from the router. Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting this vulnerability or related exploit patterns. If feasible, replace affected devices with models not impacted by this vulnerability or with updated firmware. Regularly check for vendor updates or security advisories to apply patches promptly once available. Additionally, enforce strong network perimeter defenses and educate network administrators about this vulnerability to ensure rapid response to potential incidents.

Description

A weakness has been identified in D-Link DIR-823X 250416. Affected by this issue is the function sub_412E7C of the file /goform/set_wifidog_settings. Executing a manipulation of the argument wd_enable can lead to command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.

Impact

The impact of CVE-2026-1125 is significant for organizations using the D-Link DIR-823X router, as successful exploitation grants remote attackers the ability to execute arbitrary commands on the device. This can lead to full compromise of the router, enabling attackers to intercept, modify, or redirect network traffic, deploy malware, or create persistent backdoors. The integrity and availability of network services can be severely affected, potentially causing denial of service or data breaches. Since the vulnerability requires no authentication or user interaction, it can be exploited by any remote attacker with network access, increasing the attack surface. Organizations relying on these routers for critical infrastructure or sensitive data transmission are at risk of operational disruption and data compromise. The public availability of exploit code further elevates the threat, potentially leading to widespread attacks targeting vulnerable devices globally.

Summary

CVE-2026-1125 identifies a command injection vulnerability in the D-Link DIR-823X router firmware version 250416. The vulnerability exists in the function sub_412E7C within the /goform/set_wifidog_settings endpoint, where the wd_enable parameter is not properly sanitized. This improper input validation allows an attacker to inject arbitrary system commands remotely without requiring authentication or user interaction. The attack vector is network-based, meaning an attacker can exploit this vulnerability over the internet or local network. The vulnerability impacts the confidentiality, integrity, and availability of the device by enabling remote code execution, potentially allowing attackers to take full control of the router, manipulate network traffic, or disrupt service. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) reflects a medium severity with partial impact on confidentiality, integrity, and availability, and an exploit code has been publicly disclosed, increasing the likelihood of exploitation. No official patches or mitigations have been published by D-Link at the time of disclosure, leaving devices vulnerable. The vulnerability is particularly critical for environments relying on this router model for network perimeter security or internet access.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Feb 2026, 22:51 UTC

Technical details

References

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