CVE-2025-41679VulnerabilityPublished 21 Jul 2025Updated 3 Nov 2025

CVE-2025-41679: MB connect line mbNET.mini · Out-of-bounds Write

Affects MB connect line mbNET.miniSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

5.3Medium

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

EPSS: 0.7% chance of exploitation in 30 days – higher than 54% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
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 impacted component 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 impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 21 Jul 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
MB connect line mbNET.mini	Affected =0.0.0	Fixed in–

AI-suggested

1. Network Segmentation: Isolate mbNET.mini devices and their management interfaces from untrusted networks, including the internet, using firewalls and VLANs to limit exposure to potential attackers. 2. Access Control: Restrict access to the Conftool service to authorized personnel and trusted network segments only, employing IP whitelisting or VPNs where possible. 3. Monitoring and Detection: Implement network monitoring to detect unusual or malformed traffic targeting the Conftool service or mbNET.mini devices, enabling early detection of exploitation attempts. 4. Vendor Coordination: Engage with MB connect line for timely updates and patches addressing this vulnerability; apply patches promptly once available. 5. Disable Unused Services: If the network initializing wizard service (Conftool) is not required in the operational environment, disable it to eliminate the attack surface. 6. Incident Response Preparation: Develop and test response plans for potential denial of service incidents affecting industrial network devices to minimize operational impact. 7. Device Hardening: Follow MB connect line’s security best practices for device configuration, including strong authentication methods and firmware updates.

Description

An unauthenticated remote attacker could exploit a buffer overflow vulnerability in the device causing a denial of service that affects only the network initializing wizard (Conftool) service.

Impact

For European organizations, the primary impact of CVE-2025-41679 is the potential denial of service on mbNET.mini devices, which are often deployed in industrial control and automation environments. Disruption of the network initializing wizard service could delay or prevent proper network configuration, leading to operational downtime or degraded network connectivity. This can affect manufacturing lines, critical infrastructure, and industrial processes that rely on continuous network availability. Although the vulnerability does not allow data theft or manipulation, the loss of availability can cause significant operational and financial consequences, especially in time-sensitive or safety-critical environments. The unauthenticated remote exploitability increases risk, particularly if devices are exposed to less trusted networks or lack adequate segmentation. European industries with extensive use of MB connect line products, such as automotive manufacturing, energy, and utilities, may face increased exposure. The medium severity rating suggests that while the threat is not critical, it warrants timely mitigation to prevent potential service disruptions and maintain operational resilience.

CWE-787Out-of-bounds Write (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #5
The product writes data past the end, or before the beginning, of the intended buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Nov 2025, 01:50 UTC

WeaknessesCWE-787

Technical details

References

Community reviews

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