Cyber Resilience

CVE-2023-34139

High

Published: 17 July 2023

Published
17 July 2023
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0019 40.3th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-34139 is a high-severity OS Command Injection (CWE-78) vulnerability in Zyxel Usg 2200-Vpn Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked at the 40.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker…

more

to execute some OS commands on an affected device.

CWE(s)
CWE-78

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

zyxel
usg 2200-vpn firmware
4.20 — 5.37
zyxel
usg flex 100 firmware
4.50 — 5.37
zyxel
usg flex 100w firmware
4.50 — 5.37
zyxel
usg flex 200 firmware
4.50 — 5.37
zyxel
usg flex 50 firmware
4.50 — 5.37
zyxel
usg flex 500 firmware
4.50 — 5.37
zyxel
usg flex 50w firmware
4.50 — 5.37
zyxel
usg flex 700 firmware
4.50 — 5.37
zyxel
zywall vpn100 firmware
4.20 — 5.37
zyxel
zywall vpn2s firmware
4.20 — 5.37
+5 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References