VulnerabilityPublished 9 Mar 2026

CVE-2025-41762: MBS UBR-01 Mk II · Use of Weak Hash

Affects MBS UBR-01 Mk IISource CVE Database V5

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Not known to be exploited · CVSS 6.2 Medium : upgrade to 6.0.1.0 when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score

6.2Medium

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

EPSS: 0.08% chance of exploitation in 30 days – higher than 0% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6.0.1.0

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

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

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

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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

Upgrade UBR-01 Mk II and UBR-02 and UBR-LON to 6.0.1.0.

Affected software

Product	Affected	Fixed in
MBSUBR-01 Mk II	Affected <6.0.1.0	Fixed in 6.0.1.0
MBSUBR-02	Affected <6.0.1.0	Fixed in 6.0.1.0
MBSUBR-LON	Affected <6.0.1.0	Fixed in 6.0.1.0

AI-suggested

To mitigate CVE-2025-41762, organizations should first restrict access to the wwwdnload.cgi endpoint by implementing network segmentation and access controls limiting access to trusted administrators only. Disabling or restricting the backup functionality exposed via this endpoint until a patch is available can prevent exploitation. Monitoring network traffic for unauthorized access attempts to the vulnerable endpoint can help detect potential attacks. Once the vendor releases a patch or updated firmware addressing the weak hash usage, organizations must promptly apply these updates to eliminate the vulnerability. Additionally, organizations should review and enhance their cryptographic policies to ensure strong, industry-standard hash algorithms are used for all backup and authentication processes. Employing multi-factor authentication and strong password policies can reduce the impact of credential compromise. Regularly auditing device configurations and backup procedures will help identify and remediate similar weaknesses proactively. Finally, educating network administrators about this vulnerability and secure device management practices will strengthen overall security posture.

Description

An unauthenticated attacker can abuse the weak hash of the backup generated by the wwwdnload.cgi endpoint to gain unauthorized access to sensitive data, including password hashes and certificates.

Impact

The primary impact of CVE-2025-41762 is the unauthorized disclosure of sensitive data, including password hashes and certificates stored within backup files. This can lead to credential compromise, allowing attackers to impersonate legitimate users or devices, escalate privileges, and potentially gain persistent access to the network environment. Although the vulnerability does not directly affect system integrity or availability, the exposure of authentication credentials can facilitate further attacks such as man-in-the-middle, unauthorized configuration changes, or data exfiltration. Organizations using the MBS UBR-01 Mk II in critical infrastructure or enterprise networks face increased risk of targeted attacks exploiting this weakness. The local network access requirement limits the attack surface to internal or compromised networks, but insider threats or attackers who have breached perimeter defenses could exploit this vulnerability. The lack of known exploits currently reduces immediate risk, but the medium severity rating indicates a significant threat if weaponized. Overall, the vulnerability undermines the confidentiality of critical device data, potentially compromising broader network security.

CWE-328Use of Weak Hash (opens in a new tab)
Base weaknessOWASP Top 10 A04:2025: Cryptographic Failures (opens in a new tab)
The product uses an algorithm that produces a digest (output value) that does not meet security expectations for a hash function that allows an adversary to reasonably determine the original input (preimage attack), find another input that can produce the same hash (2nd preimage attack), or find multiple inputs that evaluate to the same hash (birthday attack).
Architecture and Design
Use an adaptive hash function that can be configured to change the amount of computational effort needed to compute the hash, such as the number of iterations ("stretching") or the amount of memory required. Some hash functions perform salting automatically.
OWASP Cheat Sheets
Cryptographic Storage (opens in a new tab)
Key Management (opens in a new tab)
Transport Layer Protection (opens in a new tab)
User Privacy Protection (opens in a new tab)
Password Storage (opens in a new tab)
OWASP ASVS 4.0.3
V2.8.3 (opens in a new tab)
V8.3.7 (opens in a new tab)
V2.9.3 (opens in a new tab)
Attack patterns
Web Services API Signature Forgery Leveraging Hash Function Extension Weakness (opens in a new tab)
Subvert Code-signing Facilities (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

mbs-solutions.de/mbs-2025-0001 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Mar 2026, 09:42 UTC

WeaknessesCWE-328

Technical details

References

Community reviews

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