CVE-2025-14208VulnerabilityPublished 8 Dec 2025

CVE-2025-14208: D-Link DIR-823X · Command Injection

Affects D-Link DIR-823XSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 3.3% chance of exploitation in 30 days – higher than 88% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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: Low
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: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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 8 Dec 2025
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 2026-10-25.

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
GitHubpanda666-888/vuls`pkg:github/panda666-888/vuls`Other threats	Affected =20250416	Fixed in–

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AI-suggested

1. Immediately restrict access to the router's management interface from the WAN side by disabling remote management or limiting it to trusted IP addresses. 2. Monitor network traffic for unusual patterns or command injection attempts targeting the /goform/set_wan_settings endpoint. 3. Implement network segmentation to isolate vulnerable devices from critical systems. 4. Regularly audit router configurations and logs for signs of compromise. 5. Apply firmware updates from D-Link as soon as they become available to address this vulnerability. 6. If updates are not yet available, consider replacing affected devices with models not impacted by this vulnerability. 7. Employ intrusion detection/prevention systems (IDS/IPS) capable of detecting command injection patterns. 8. Educate IT staff on the risks of exposed router management interfaces and the importance of secure configurations. 9. Use strong, unique credentials for router administration to reduce risk from other attack vectors. 10. Coordinate with ISPs to identify and mitigate attacks originating from or targeting vulnerable routers.

Description

CVE-2025-14208 is a medium severity command injection vulnerability in the D-Link DIR-823X router firmware up to version 20250416. The flaw exists in the /goform/set_wan_settings endpoint, specifically in the sub_415028 function, where the ppp_username parameter is improperly sanitized, allowing remote attackers to inject arbitrary commands. Exploitation does not require user interaction or authentication, making it remotely exploitable over the network. Although no known exploits are currently observed in the wild, a public exploit has been released, increasing the risk of attacks. The vulnerability impacts confidentiality, integrity, and availability by enabling command execution on the device. European organizations using this router model, especially in countries with high D-Link market penetration and critical infrastructure reliance on such devices, are at risk. Mitigation involves applying firmware updates once available, restricting WAN access to management interfaces, and monitoring network traffic for suspicious activity. Countries like Germany, France, Italy, Spain, and the UK are likely most affected due to market share and infrastructure considerations.

Impact

For European organizations, this vulnerability poses a significant risk to network security and operational continuity. Compromised routers can lead to interception of sensitive data, unauthorized network access, and disruption of internet connectivity. Organizations relying on the DIR-823X for critical communications or as part of their perimeter defense may face data breaches, espionage, or service outages. The ability to execute arbitrary commands remotely without authentication increases the attack surface, especially for organizations with exposed WAN interfaces. This risk is amplified in sectors such as finance, healthcare, government, and critical infrastructure, where confidentiality and availability are paramount. Additionally, compromised routers can be leveraged as entry points for lateral movement within corporate networks or as part of botnets for broader attacks. The medium severity rating suggests moderate urgency but does not diminish the potential for impactful exploitation in targeted attacks.

Summary

CVE-2025-14208 is a command injection vulnerability identified in the D-Link DIR-823X router firmware up to version 20250416. The vulnerability resides in the function sub_415028 within the /goform/set_wan_settings endpoint, where the ppp_username parameter is not properly sanitized before being used in system commands. This improper input validation allows an attacker to inject arbitrary OS commands remotely without requiring authentication or user interaction. The attack vector is network-based, leveraging the router's WAN interface, which is typically exposed to the internet. Successful exploitation can lead to full command execution on the device, potentially allowing attackers to manipulate router configurations, intercept or redirect traffic, deploy malware, or pivot into internal networks. The CVSS 4.0 score is 5.3 (medium severity), reflecting the lack of authentication but limited scope and impact compared to higher severity vulnerabilities. Although no active exploitation has been reported, a public exploit code release increases the likelihood of attacks. The vulnerability affects the confidentiality, integrity, and availability of the router and connected networks. The lack of vendor-provided patches at the time of disclosure necessitates immediate mitigation efforts by users and administrators.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Dec 2025, 05:00 UTC

Technical details

References

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