CVE-2025-1732: An improper privilege management vulnerability in the recovery function of the Zyxel USG FLEX H series uOS fir

Routine

MEDIUM 6.7MITIGATE

CVE-2025-1732 is a medium-severity flaw (CVSS 6.7) affecting uos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-269
Published	2025-04-22
Last modified	2026-06-17

Publisher (CNA): Zyxel Corporation · Vendor: zyxel

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-22 03:15 UTCPublished CVE record published
2026-06-17 08:39 UTCUpdated Record last modified

zyxel uos MITIGATE

Affected: 1.31

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.31

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-1732?

uos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-1732 being exploited?

CVE-2025-1732 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-1732 affect?

CVE-2025-1732 affects uos. Severity is medium (CVSS 6.7). 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 conf

How urgent is CVE-2025-1732?

Priority 26/100. No elevated risk signals yet.

Software pages

Zyxel vulnerabilities

Related CVEs

CVE-2025-1731 HIGH 7.8 UPGRADE An incorrect permission assignment vulnerability in the PostgreSQL commands of the Zyxel USG FLEX H series uOS

References

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