What is the CVSS score of CVE-2026-1139?

CVE-2026-1139 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of 520w Firmware are affected by CVE-2026-1139?

Organizations using A vulnerability face significant risk from CVE-2026-1139, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-1139?

Yes, a public proof-of-concept exploit is available for CVE-2026-1139. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-1139?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

520w Firmware CVE-2026-1139

HIGH

Buffer Overflow (CWE-119)

2026-01-19 cna@vuldb.com

Buffer Overflow 520w Firmware Utt

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 04, 2026 - 20:41 vuln.today

Public exploit code

CVE Published

Jan 19, 2026 - 05:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability has been found in UTT 进取 520W 1.7.7-180627. This vulnerability affects the function strcpy of the file /goform/ConfigExceptMSN. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Remote code execution in UTT 520W firmware 1.7.7-180627 stems from a buffer overflow in the /goform/ConfigExceptMSN endpoint accessible to authenticated users. Public exploit code exists for this vulnerability, and the vendor has not released a patch despite early notification. An attacker with valid credentials can achieve complete system compromise including data theft, modification, and service disruption.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects 520W Firmware. A vulnerability has been found in UTT 进取 520W 1.7.7-180627. This vulnerability affects the function strcpy of the file /goform/ConfigExceptMSN. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.