An improper privilege management vulnerability in the recovery function of the Zyxel USG FLEX H series uOS firmware version V1.31 and earli…

published 2025-04-22 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-12335

cvss: 6.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits: 0; none known

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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 18 mo ago (2025-04-23)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

Zyxel USG FLEX H series uOS firmware

Classification

Weakness

CWE-269 Improper Privilege Management

References

zyxel.com /global/en/support/security-advisories/zyxel-security-advisory-for-incorrect-permission-assignment-and-imprope
vendor-advisory

Sources

CVE List CVE-2025-1732
NVD CVE-2025-1732

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Summary