CVE-2025-9581VulnerabilityPublished 28 Aug 2025

CVE-2025-9581: Comfast CF-N1 · Command Injection

Affects Comfast CF-N1Source CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 4.8% chance of exploitation in 30 days – higher than 91% 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 28 Aug 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 2026-10-26.

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
Comfast CF-N1	Affected =2.6.0	Fixed in–

AI-suggested

To mitigate CVE-2025-9581, European organizations should first inventory their network devices to identify any Comfast CF-N1 units running firmware version 2.6.0. Immediate steps include isolating these devices from untrusted networks and restricting management interface access to trusted IP addresses only. Network segmentation should be enforced to limit the exposure of vulnerable devices. As a temporary workaround, disabling or restricting the multi_pppoe function or the /usr/bin/webmgnt service, if feasible, can reduce attack surface. Implementing intrusion detection systems (IDS) or intrusion prevention systems (IPS) with signatures targeting command injection attempts on these devices can help detect exploitation attempts. Regularly auditing device configurations and logs for suspicious activity is recommended. Additionally, organizations should enforce strict privilege management on network devices to minimize the risk posed by low-privilege attackers. Finally, educating network administrators about this vulnerability and encouraging vigilance against unusual device behavior will support early detection and response.

Description

A vulnerability was detected in Comfast CF-N1 2.6.0. This impacts the function multi_pppoe of the file /usr/bin/webmgnt. Performing manipulation of the argument phy_interface results in command injection. The attack may be initiated remotely. The exploit is now public and may be used.

Impact

For European organizations, the exploitation of CVE-2025-9581 could lead to unauthorized command execution on Comfast CF-N1 devices, resulting in compromised network infrastructure. This can affect confidentiality by enabling attackers to intercept or redirect network traffic, integrity by allowing modification of device configurations or firmware, and availability by causing device malfunctions or denial of service. Organizations relying on these devices for critical network connectivity, especially in sectors like telecommunications, small ISPs, or enterprises using PPPoE for WAN access, may face operational disruptions and data breaches. The medium severity rating suggests that while the impact is not catastrophic, the ease of remote exploitation without user interaction or authentication makes it a credible threat. Given the public availability of exploit code, attackers could automate attacks against vulnerable devices, increasing the likelihood of widespread compromise. European organizations with limited network segmentation or outdated device management practices are particularly at risk. Additionally, compromised devices could be used as footholds for lateral movement within corporate networks or as part of botnets targeting other infrastructure.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Aug 2025, 20:32 UTC

Technical details

References

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