Mercku M6a up to 2.1.0 Telnet backdoor

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Mercku M6a up to 2.1.0. Affected by this vulnerability is an unknown functionality of the component Telnet. Executing a manipulation can lead to backdoor. This vulnerability is handled as CVE-2025-62773. The attack can only be done within the local network. Additionally, an exploit exists.

Detailsinfo

A vulnerability has been found in Mercku M6a up to 2.1.0 and classified as problematic. This vulnerability affects some unknown functionality of the component Telnet. The manipulation with an unknown input leads to a backdoor vulnerability. The CWE definition for the vulnerability is CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Mercku M6a devices through 2.1.0 allow TELNET sessions via a router.telnet.enabled.update request by an administrator.

The advisory is shared for download at seclists.org. This vulnerability was named CVE-2025-62773 since 10/22/2025. The exploitation appears to be easy. The attack can only be initiated within the local network. The exploitation needs additional levels of successful authentication. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1588.001.

It is possible to download the exploit at blog.nullvoid.me. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202510-3178). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 2.4
CNA Vector (MITRE): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Backdoor
CWE: CWE-912
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/22/2025 Advisory disclosed
10/22/2025 +0 days CVE reserved
10/22/2025 +0 days VulDB entry created
10/24/2025 +2 days VulDB entry last update

Sourcesinfo

Advisory: seclists.org
Status: Not defined

CVE: CVE-2025-62773 (🔒)
GCVE (CVE): GCVE-0-2025-62773
GCVE (VulDB): GCVE-100-329296
CNNVD: CNNVD-202510-3178 - Mercku M6a 安全漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/22/2025 09:33
Updated: 10/24/2025 06:38
Changes: 10/22/2025 09:33 (65), 10/24/2025 06:38 (6)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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