TI-2026-12488 Aliases CVE-2026-14818 GHSA-75p7-jv3w-pjpc

Path traversal in Zyxel ATP series firmware

LOW 34CWE-22Published 2026-08-04 · Updated 2026-08-04

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A path traversal vulnerability in the CLI command used to execute configuration files in Zyxel ATP series firmware versions from V4.32 through V5.42 Patch 1, USG FLEX series firmware versions from V4.50 through V5.42 Patch 1, USG FLEX 50(W) series firmware versions from V4.16 through V5.42 Patch 1, and USG20(W)-VPN series firmware versions from V4.16 through V5.42 Patch 1 could allow an authenticated attacker with administrator privileges to execute a crafted malicious configuration file on an affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00571 47th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	ATP series firmware	from V4.32 through V5.42 Patch 1	—	No fix listed	CNA
Zyxel	USG FLEX series firmware	from V4.50 through V5.42 Patch 1	—	No fix listed	CNA
Zyxel	USG FLEX 50(W) series firmware	from V4.16 through V5.42 Patch 1	—	No fix listed	CNA
Zyxel	USG20(W)-VPN series firmware	from V4.16 through V5.42 Patch 1	—	No fix listed	CNA

ATP series firmware VendorZyxel Affected from V4.32 through V5.42 Patch 1 Fixed in — No fix listed CNA
USG FLEX series firmware VendorZyxel Affected from V4.50 through V5.42 Patch 1 Fixed in — No fix listed CNA
USG FLEX 50(W) series firmware VendorZyxel Affected from V4.16 through V5.42 Patch 1 Fixed in — No fix listed CNA
USG20(W)-VPN series firmware VendorZyxel Affected from V4.16 through V5.42 Patch 1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-14818
2026-10-03 Alias added: GHSA-75p7-jv3w-pjpc

References

Advisory 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-path-traversal-vulnerability-in-the-configuration-file-execution-cli-command-of-zld-firewalls-08-04-2026

TI-2023-16198 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-16197 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-13281 OS command injection in Zyxel ZyWALL/USG series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-12582 OS command injection in Zyxel NAS326 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2022-12682 OS command injection in Zyxel USG FLEX 100 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2020-17772 Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with… KEVCVSS 3.1CRITICAL 9.8

See all 340 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences