CVE-2026-36180Public exploit

System-file modification via bind-mount integrity bypass

Published Jun 4, 2026 · Updated Jun 4, 2026

Improper access control in GNCC GP5 firmware 7.1.76 allows physically proximate attackers to modify system files via bind mounts. The firmware uses runtime overlays for its Squashfs system image without enforcing integrity when a bind mount replaces a protected path. Physical access and a root shell obtained through the exposed UART boot path are required; modifications affect files and binaries only until reboot.

CVSS severity4.6
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in GNCC GP5 firmware 7.1.76 allows physically proximate attackers to modify system files via bind mounts. The firmware uses runtime overlays for its Squashfs system image without enforcing integrity when a bind mount replaces a protected path. Physical access and a root shell obtained through the exposed UART boot path are required; modifications affect files and binaries only until reboot.

The record

CVE
CVE-2026-36180
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-284, T1685
Attack vector
physical
Privileges
admin

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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 vectorphysical
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6CISA-ADPCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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)
Vectorphysical
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1685Disable or Modify Tools

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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