What is the CVSS score of CVE-2026-1138?

CVE-2026-1138 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-2026-1138?

Organizations using A flaw face significant risk from CVE-2026-1138, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-1138?

Yes, a public proof-of-concept exploit is available for CVE-2026-1138. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-1138?

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

520w Firmware CVE-2026-1138

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 - 20:40 vuln.today

Public exploit code

CVE Published

Jan 19, 2026 - 05:16 nvd

HIGH 8.8

DescriptionCVE.org

A flaw has been found in UTT 进取 520W 1.7.7-180627. This affects the function strcpy of the file /goform/ConfigExceptQQ. Executing a manipulation can lead to buffer overflow. The attack may be performed from remote. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Buffer overflow in UTT 520W firmware version 1.7.7-180627 allows authenticated remote attackers to execute arbitrary code through the /goform/ConfigExceptQQ endpoint via unsafe string operations. Public exploit code is available and the vendor has not provided a patch despite early notification. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to UTT 进取 520W

Exploit

Send crafted payload to /goform/ConfigExceptQQ

Execution

Trigger strcpy buffer overflow

Impact

Execute arbitrary code with device privileges

Access

Authenticate to UTT 进取 520W

Exploit

Send crafted payload to /goform/ConfigExceptQQ

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/ConfigExceptQQ 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 vulnerability to 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-2026-1138 vulnerability details – vuln.today

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520w Firmware CVE-2026-1138

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