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520w Firmware CVE-2026-0840

HIGH
Buffer Overflow (CWE-119)
2026-01-11 cna@vuldb.com
Buffer Overflow 520w Firmware
8.8
CVSS 3.1 · NVD
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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

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 13, 2026 - 21:56 vuln.today
Public exploit code
CVE Published
Jan 11, 2026 - 07:15 nvd
HIGH 8.8

DescriptionCVE.org

A security vulnerability has been detected in UTT 进取 520W 1.7.7-180627. Affected by this vulnerability is the function strcpy of the file /goform/formConfigNoticeConfig. The manipulation of the argument timestart leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly 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 (version 1.7.7-180627) via a stack buffer overflow in the /goform/formConfigNoticeConfig endpoint allows unauthenticated attackers to execute arbitrary code with full system privileges. 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 to device web interface
Exploit
Send crafted POST to /goform/formConfigNoticeConfig
Execution
Overflow timestart parameter in strcpy
Impact
Execute arbitrary code with device privileges
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Vulnerability AssessmentAI

Exploitation Authenticated access to UTT 进取 520W device running version 1.7.7-180627 or earlier. … 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.
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Recommended ActionAI

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

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CVE-2026-0840 vulnerability details – vuln.today
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