What is the CVSS score of CVE-2026-0838?

CVE-2026-0838 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-2026-0838?

Organizations using A security flaw face significant risk from CVE-2026-0838, a buffer overflow vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2026-0838?

Yes, a public proof-of-concept exploit is available for CVE-2026-0838. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-0838?

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

520w Firmware CVE-2026-0838

HIGH

Buffer Overflow (CWE-119)

2026-01-11 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

Jan 13, 2026 - 22:02 vuln.today

Public exploit code

CVE Published

Jan 11, 2026 - 06:15 nvd

HIGH 8.8

DescriptionCVE.org

A security flaw has been discovered in UTT 进取 520W 1.7.7-180627. This impacts the function strcpy of the file /goform/ConfigWirelessBase. Performing a manipulation of the argument ssid results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. 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 buffer overflow in the wireless configuration endpoint allows authenticated attackers to achieve complete system compromise with high integrity and availability impact. Public exploit code exists for this vulnerability, and the vendor has not provided a patch despite early disclosure notification. The flaw requires network access but no user interaction, making it readily exploitable in environments where administrative credentials are available or compromised.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects 520W Firmware. A security flaw has been discovered in UTT 进取 520W 1.7.7-180627. This impacts the function strcpy of the file /goform/ConfigWirelessBase. Performing a manipulation of the argument ssid results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. 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.