CVE-2025-67091Public exploit

Root file overwrite via symlinked temporary lock

Published Jan 8, 2026 · Updated Jan 8, 2026

Insecure temporary-file handling in GL.iNet GL-AX1800 firmware 4.6.4 and 4.6.8 allows local users to overwrite root-owned files. The root-privileged /usr/libexec/opkg-call script redirects file descriptor 200 to /tmp/opkg.lock without rejecting symbolic links, so a planted link makes the shell open and truncate its target. Exploitation requires local access and timing a link replacement while package management triggers the wrapper; successful targeting can yield root control.

CVSS severity6.5
Medium
EPSS probability3.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure temporary-file handling in GL.iNet GL-AX1800 firmware 4.6.4 and 4.6.8 allows local users to overwrite root-owned files. The root-privileged /usr/libexec/opkg-call script redirects file descriptor 200 to /tmp/opkg.lock without rejecting symbolic links, so a planted link makes the shell open and truncate its target. Exploitation requires local access and timing a link replacement while package management triggers the wrapper; successful targeting can yield root control.

The record

CVE
CVE-2025-67091
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1068Exploitation for Privilege Escalation

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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