Which versions of TOTOLINK T10 are affected by CVE-2025-6139?

CVE-2025-6139 is a low-severity vulnerability (CVSS 3.9). The limited severity suggests constrained impact, typically requiring specific conditions or local access for exploitation.

Is there a public PoC exploit available for CVE-2025-6139?

Yes, a public proof-of-concept exploit is available for CVE-2025-6139. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-6139?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

TOTOLINK T10 CVE-2025-6139

Q: What is the CVSS score of CVE-2025-6139?

CVE-2025-6139 has a CVSS 4.0 base score of 1.1 (Low). CVSS vector: CVSS:4.0/AV:A/AC:H/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

EUVD-2025-18435 LOW

Credentials Management Errors (CWE-255)

2025-06-16 cna@vuldb.com

Authentication Bypass T10 Firmware

1.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.1 LOW

CVSS:4.0/AV:A/AC:H/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

3.9 LOW

AV:A, AC:H, PR:H per description; low CIA impact.

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

4.0 AV:A/AC:H/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from NVD.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:H/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

3.9 (LOW) 1.1 (LOW)

EUVD ID Assigned

Mar 14, 2026 - 21:59 euvd

EUVD-2025-18435

Analysis Generated

Mar 14, 2026 - 21:59 vuln.today

PoC Detected

Jun 26, 2025 - 16:27 vuln.today

Public exploit code

CVE Published

Jun 16, 2025 - 21:15 cve.org

LOW 1.1

CVE Published

Jun 16, 2025 - 21:15 nvd

LOW 3.9

DescriptionCVE.org

A vulnerability, which was classified as problematic, has been found in TOTOLINK T10 4.1.8cu.5207. Affected by this issue is some unknown functionality of the file /etc/shadow.sample. The manipulation leads to use of hard-coded password. The attack can only be initiated within the local network. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.

AnalysisAI

Hard-coded password in TOTOLINK T10 firmware 4.1.8cu.5207 allows local network attackers with high privileges to access the /etc/shadow.sample file. The vulnerability is publicly exploited but has a low EPSS score (0.05%) and high attack complexity, limiting real-world risk.

Technical ContextAI

The vulnerability involves a hard-coded password (CWE-255) in the /etc/shadow.sample file of TOTOLINK T10 firmware. The CPE indicates the exact affected version is 4.1.8cu.5207_b20210320. The file typically contains password hashes, and hard-coded credentials can allow authentication bypass.

RemediationAI

No vendor-released patch identified at time of analysis. As a workaround, restrict local network access to the device and monitor for unauthorized access. Disable remote management if not needed. Note that these mitigations may reduce functionality.