CVE-2025-1731

HIGH
7.8
CVSS Score
Published: April 22, 2025 at 01:52 AM UTC
Updated: June 17, 2026 at 08:39 AM UTC
2 products affected across 1 vendorUosUSG FLEX H

Using USG FLEX H series uOS firmware by Zyxel?

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Severity
HIGH7.8
Exploit prediction
EPSS 0.9%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.20 ≤ v < 1.32
zyxel-usg-flex-100h (same device) · zyxel-usg-flex-100hp (same device) · zyxel-usg-flex-200h (same device) · zyxel-usg-flex-200hp (same device) · zyxel-usg-flex-500h (same device) · zyxel-usg-flex-50h (same device) · zyxel-usg-flex-50hp (same device) · zyxel-usg-flex-700h (same device)
1.20 ≤ v ≤ 1.31

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHZyxel
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-732

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