TI-2021-13993 Aliases CVE-2021-35027 GHSA-gf8r-6336-2wmx

Path traversal in Zyxel ZyWALL VPN2S Firmware

LOW 37CWE-27Published 2021-09-29 · Updated 2024-08-04

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information.

Why it matters now

EPSS 0.02045 81st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	ZyWALL VPN2S Firmware	1.12(ABLN.0)C0	—	No fix listed	CNA

ZyWALL VPN2S Firmware VendorZyxel Affected 1.12(ABLN.0)C0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:zyxel:zywall_vpn2s_firmware:1.12\(abln.0\)c0:::::::*	1.12(abln.0)c0	Vulnerable	Zyxel
cpe:2.3:h:zyxel:zywall_vpn2s:-:::::::*	not specified by NVD	Running on	Zyxel

cpe:2.3:o:zyxel:zywall_vpn2s_firmware:1.12\(abln.0\)c0:*:*:*:*:*:*:* Versions 1.12(abln.0)c0 Vulnerable ·Zyxel
cpe:2.3:h:zyxel:zywall_vpn2s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-35027
2026-10-03 Alias added: GHSA-gf8r-6336-2wmx

References

Patch 1

https://www.zyxel.com/support/Zyxel_security_advisory_for_directory_traversal_and_command_injection_vulnerabilities_of_VPN2S_Firewall.shtml

TI-2023-16200 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 8.8
TI-2023-16983 OS command injection in Zyxel USG FLEX series firmware CVSS 3.1HIGH 8.8
TI-2023-16199 A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36… CVSS 3.1HIGH 8.8
TI-2023-13277 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 8.8
TI-2023-16985 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 8.0
TI-2023-16982 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 8.0

See all 8 →

Sources

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