CVE-2026-76852Network attack vector

Unauthorized firmware installation via forgeable authenticity check

Published Sep 15, 2026 · Updated Sep 15, 2026

Improper firmware validation in Netcore NR268 1.7.121109 allows remote attackers to install unauthorized firmware via the web interface. The put_file.cgi upload path and check_image_uuid.c pass forged authenticity results to mtd_write instead of enforcing a trusted signature. The authentication requirement is undisclosed; successful exploitation replaces trusted appliance code and enables persistent device compromise.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper firmware validation in Netcore NR268 1.7.121109 allows remote attackers to install unauthorized firmware via the web interface. The put_file.cgi upload path and check_image_uuid.c pass forged authenticity results to mtd_write instead of enforcing a trusted signature. The authentication requirement is undisclosed; successful exploitation replaces trusted appliance code and enables persistent device compromise.

The record

CVE
CVE-2026-76852
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Netcore
Product
NR268
Classifications
T1601
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.7.121109

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Netcore · NR268version=1.7.121109

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1601Modify System Image

Public exploit references

No public exploit references are available in this record.

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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