ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2025-1731

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 authenticat

Published Apr 22, 2025 · catalog updated Feb 26, 2026 · Zyxel USG FLEX H series uOS firmware

Check this week

CVE-2025-1731 is not in CISA KEV. FIRST estimates a 94.00% chance of exploitation in the next 30 days. Check whether you run Zyxel USG FLEX H series uOS firmware.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
94.00%
Remediation
Advisory link
Affected products
vendor Zyxel USG FLEX H series uOS firmware from V1.20 through V1.31

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Zyxel USG FLEX H series uOS firmware from V1.20 through V1.31from V1.20 through V1.31

How to fix CVE-2025-1731

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-1731 is not in CISA KEV. FIRST estimates a 94.00% chance of exploitation in the next 30 days. Check whether you run Zyxel USG FLEX H series uOS firmware.

Which versions are affected?

Compare what you have installed with Zyxel USG FLEX H series uOS firmware from V1.20 through V1.31 from V1.20 through V1.31. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 94.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

PostgreSQL security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2025 · EUVD

    Detected

    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 toke

  2. Feb 26, 2026 · EUVD

    Updated

    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 toke

Sources

  • CVE.orgVulnerability recordCVE-2025-1731

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-12140

    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 privilege

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.