VulnerabilityPublished 6 Jul 2025

CVE-2025-7082: Belkin F9K1122 · OS Command Injection

Affects Belkin F9K1122Source CVE Database V5

Public exploit available · 17% EPSS · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 17.1% chance of exploitation in 30 days – higher than 97% 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 6 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CVSS exploit maturity: proof of concept public
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), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

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 or the CVSS exploit maturity 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
GitHubbelkin/F9K1122`pkg:github/belkin/F9K1122`Other threats	Affected =1.00.33	Fixed in–

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AI-suggested

Immediate mitigation should include isolating the affected Belkin F9K1122 devices from critical network segments to limit potential damage.
Disable remote management interfaces on the router to prevent external exploitation.
Restrict access to the router’s web interface to trusted internal IP addresses only, using firewall rules or access control lists.
Monitor network traffic for unusual activity or command execution attempts targeting the router’s management interface.
6. Consider replacing the affected devices with alternative routers from vendors with active security support. 7. Implement network segmentation to limit lateral movement if a router is compromised. 8. Educate IT staff about this vulnerability and ensure incident response plans include steps for router compromise scenarios. 9. Use network intrusion detection systems (NIDS) tuned to detect exploitation attempts targeting this vulnerability’s specific parameters.

Description

A vulnerability was found in Belkin F9K1122 1.00.33 and classified as critical. Affected by this issue is the function formBSSetSitesurvey of the file /goform/formBSSetSitesurvey of the component webs. The manipulation of the argument wan_ipaddr/wan_netmask/wan_gateway/wl_ssid is directly passed by the attacker/so we can control the wan_ipaddr/wan_netmask/wan_gateway/wl_ssid leads to os command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

For European organizations using Belkin F9K1122 routers with firmware version 1.00.33, this vulnerability poses a risk of remote code execution that could compromise network perimeter security. Successful exploitation could allow attackers to execute arbitrary commands, potentially leading to unauthorized access, data exfiltration, network reconnaissance, or pivoting to internal systems. This could disrupt business operations, compromise sensitive data, and damage organizational reputation. Given that routers often serve as the first line of defense and gateway to internal networks, their compromise can have cascading effects on confidentiality, integrity, and availability of enterprise resources. Small and medium enterprises, as well as home office setups relying on this router model, may be particularly vulnerable due to limited IT security resources. The medium CVSS score reflects some mitigating factors such as limited scope and privileges, but the absence of authentication and user interaction requirements increases the threat level. The lack of a vendor patch further exacerbates the risk, necessitating immediate attention from security teams in affected organizations.

Summary

CVE-2025-7082 is a security vulnerability identified in the Belkin F9K1122 router firmware version 1.00.33. The flaw exists in the web component, specifically within the function formBSSetSitesurvey located at /goform/formBSSetSitesurvey. This function improperly handles user-supplied input parameters such as wan_ipaddr, wan_netmask, wan_gateway, and wl_ssid. An attacker can manipulate these parameters to inject arbitrary OS commands due to insufficient input validation and sanitization. This vulnerability enables remote attackers to execute commands on the underlying operating system with the privileges of the web service process. The vulnerability does not require authentication or user interaction, making it remotely exploitable over the network. Although the CVSS v4.0 score is 5.3 (medium severity), the ability to execute OS commands remotely can lead to significant compromise depending on the context. The vendor, Belkin, was contacted but has not responded or issued a patch at the time of disclosure. No known exploits are currently observed in the wild, but public disclosure increases the risk of exploitation. The vulnerability affects a specific firmware version, indicating that devices running this version or earlier are at risk. The lack of vendor response and patch availability increases the urgency for affected users to implement mitigations or consider device replacement.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Jul 2025, 14:24 UTC

Technical details

References

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