What is the CVSS score of CVE-2026-1140?

CVE-2026-1140 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-2026-1140?

Organizations using A vulnerability face significant risk from CVE-2026-1140, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-1140?

Yes, a public proof-of-concept exploit is available for CVE-2026-1140. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-1140?

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

520w Firmware CVE-2026-1140

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 - 20:42 vuln.today

Public exploit code

CVE Published

Jan 19, 2026 - 06:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was found in UTT 进取 520W 1.7.7-180627. This issue affects the function strcpy of the file /goform/ConfigExceptAli. The manipulation results in buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could 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 via a buffer overflow in the /goform/ConfigExceptAli endpoint allows authenticated attackers to execute arbitrary code with high privileges. Public exploit code exists for this vulnerability, and no patch is available from the vendor despite early disclosure notification. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to UTT device

Exploit

Send crafted request to /goform/ConfigExceptAli

Execution

Overflow strcpy buffer

Impact

Execute arbitrary code with device privileges

Access

Authenticate to UTT device

Exploit

Send crafted request to /goform/ConfigExceptAli

Execution

Overflow strcpy buffer

Impact

Execute arbitrary code with device privileges

Vulnerability AssessmentAI

Exploitation	Valid login credentials required (PR:L). … 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-2026-1140 vulnerability details – vuln.today

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520w Firmware CVE-2026-1140

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