CVE-2026-52191Public exploitNetwork attack vector

Unauthenticated device crash via unbounded port append

Published Jul 2, 2026 · Updated Jul 2, 2026

Buffer overflow in UTT nv518G firmware nv518GV3v3.2.7-210919-161313 allows remote attackers to crash the device via an HTTP request. The gohead/sub_444C8C handler copies a fixed URL prefix into a 104-byte stack buffer, then appends the unbounded port parameter with strcat. No authentication or user interaction is required; an oversized port value overwrites stack control data, but the CVE record bounds the reported impact to service interruption.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in UTT nv518G firmware nv518GV3v3.2.7-210919-161313 allows remote attackers to crash the device via an HTTP request. The gohead/sub_444C8C handler copies a fixed URL prefix into a 104-byte stack buffer, then appends the unbounded port parameter with strcat. No authentication or user interaction is required; an oversized port value overwrites stack control data, but the CVE record bounds the reported impact to service interruption.

The record

CVE
CVE-2026-52191
Published
Jul 2, 2026
Updated
Jul 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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