CVE-2025-1732

Device privilege escalation via crafted recovery file

Published Apr 22, 2025 · Updated Feb 26, 2026

Improper privilege management in Zyxel USG FLEX H Series uOS Firmware 1.31 allows local users with administrator privileges to escalate privileges. Zyxel has not disclosed how the recovery function mishandles the uploaded configuration or which privilege boundary it fails to enforce. Exploitation requires authenticated local administrator access and can compromise device confidentiality, integrity, and availability.

CVSS severity6.7
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Zyxel USG FLEX H Series uOS Firmware 1.31 allows local users with administrator privileges to escalate privileges. Zyxel has not disclosed how the recovery function mishandles the uploaded configuration or which privilege boundary it fails to enforce. Exploitation requires authenticated local administrator access and can compromise device confidentiality, integrity, and availability.

The record

CVE
CVE-2025-1732
Published
Apr 22, 2025
Updated
Feb 26, 2026
Vendor
Zyxel Networks
Product
USG FLEX H Series uOS Firmware
Classifications
CWE-269, T1548
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=<= V1.31

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Zyxel Networks · USG FLEX H Series uOS Firmwareversion=<= V1.31

Published CVSS scores

6.7Zyxel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1548Abuse Elevation Control Mechanism

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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