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

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

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

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate as low-privilege user

Exploit

Send malicious POST request to /goform/ConfigExceptMSN

Execution

Trigger strcpy buffer overflow

Impact

Execute arbitrary code with device privileges

Access

Authenticate as low-privilege user

Exploit

Send malicious POST request to /goform/ConfigExceptMSN

Execution

Trigger strcpy buffer overflow

Impact

Execute arbitrary code with device privileges

Vulnerability AssessmentAI

Exploitation	UTT 进取 520W version 1.7.7-180627 with /goform/ConfigExceptMSN endpoint accessible. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this flaw, buffer overflow.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-1139 vulnerability details – vuln.today

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520w Firmware CVE-2026-1139

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code