How severe is CVE-2025-1731?

CVE-2025-1731 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-1731 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1731?

CVE-2025-1731 affects Zyxel Uos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-1731?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-1731 have an EU (EUVD) identifier?

Yes. CVE-2025-1731 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12140.

When was CVE-2025-1731 published?

CVE-2025-1731 was published on 2025-04-22 and last updated on 2026-06-17.

CVE-2025-1731

CVE-2025-1731 is a high-severity vulnerability in Zyxel Uos with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12140
Weakness: CWE-732
Affected product: Zyxel Uos
Published: 2025-04-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2025-1731?: CVE-2025-1731 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-1731 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1731?: CVE-2025-1731 affects Zyxel Uos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-1731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-1731 have an EU (EUVD) identifier?: Yes. CVE-2025-1731 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12140.
When was CVE-2025-1731 published?: CVE-2025-1731 was published on 2025-04-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zyxel:uos:*:*:*:*:*:*:*:*

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