TI-2025-01491 Aliases CVE-2025-1732 GHSA-7wf3-pq8r-xwwq

Improper privilege management in Zyxel USG FLEX H series uOS firmware

LOW 31CWE-269Published 2025-04-22 · Updated 2026-02-26

Key facts

Attack vector: Local
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

An improper privilege management vulnerability in the recovery function of the Zyxel USG FLEX H series uOS firmware version V1.31 and earlier could allow an authenticated local attacker with administrator privileges to upload a crafted configuration file and escalate privileges on a vulnerable device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00203 10th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	USG FLEX H series uOS firmware	up to V1.31	—	No fix listed	CNA

USG FLEX H series uOS firmware VendorZyxel Affected up to V1.31 Fixed in — No fix listed CNA

CPE configurations NVD · 9

CPE	Versions	Role	Vendor
cpe:2.3:o:zyxel:uos:1.31:::::::*	1.31	Vulnerable	Zyxel
cpe:2.3:h:zyxel:usg_flex_100h:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_100hp:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_200h:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_200hp:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_500h:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_50h:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_50hp:-:::::::*	not specified by NVD	Running on	Zyxel
cpe:2.3:h:zyxel:usg_flex_700h:-:::::::*	not specified by NVD	Running on	Zyxel

cpe:2.3:o:zyxel:uos:1.31:*:*:*:*:*:*:* Versions 1.31 Vulnerable ·Zyxel
cpe:2.3:h:zyxel:usg_flex_100h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_100hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_200h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_200hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_500h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_50h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_50hp:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
cpe:2.3:h:zyxel:usg_flex_700h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2025-04-22
Zyxel USG FLEX H series uOS firmware — zyxel.com/global/en/support/security-advisories/zyxel-secur…
2 records Highest priority Priority HIGH 1 HIGH, 1 LOW
Other records, highest priority first
- TI-2025-01490 Incorrect permission assignment in Zyxel USG FLEX H series uOS firmwarePriority HIGH 69
Show all 2 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-1732
2026-10-03 Alias added: GHSA-7wf3-pq8r-xwwq

References

Advisory 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-incorrect-permission-assignment-and-improper-privilege-management-vulnerabilities-in-usg-flex-h-series-firewalls-04-22-2025

TI-2025-01490 Incorrect permission assignment in Zyxel USG FLEX H series uOS firmware CVSS 3.1HIGH 7.8
TI-2023-05872 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 7.2
TI-2024-08978 Insufficiently protected credentials in Zyxel USG FLEX H series uOS firmware CVSS 3.1HIGH 7.8
TI-2023-05873 A format string vulnerability in Zyxel ATP series firmware versions from 4.32 through… CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences