Zyxel USG FLEX H uOS up to 1.20/1.31 PostgreSQL Command permission assignment

Summaryinfo

A vulnerability classified as critical was found in Zyxel USG FLEX H uOS up to 1.20/1.31. Affected by this vulnerability is an unknown functionality of the component PostgreSQL Command Handler. The manipulation results in permission assignment. This vulnerability is cataloged as CVE-2025-1731. The attack must be initiated from a local position. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in Zyxel USG FLEX H uOS up to 1.20/1.31. It has been classified as critical. Affected is an unknown function of the component PostgreSQL Command Handler. The manipulation with an unknown input leads to a permission assignment vulnerability. CWE is classifying the issue as CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An incorrect permission assignment vulnerability in the PostgreSQL commands of the Zyxel USG FLEX H series uOS firmware versions from V1.20 through V1.31 could allow an authenticated local attacker with low privileges to gain access to the Linux shell and escalate their privileges by crafting malicious scripts or modifying system configurations with administrator-level access through a stolen token. Modifying the system configuration is only possible if the administrator has not logged out and the token remains valid.

The advisory is shared for download at zyxel.com. This vulnerability is traded as CVE-2025-1731 since 02/27/2025. The exploitability is told to be easy. The attack needs to be approached locally. Technical details are unknown but a public exploit is available.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Exploit-DB (52293) and EUVD (EUVD-2025-12140). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Zyxel

Name

• USG FLEX H uOS

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31

License

• commercial

Website

• Vendor: https://www.zyxel.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion