Cyber Resilience

CVE-2023-28767

High

Published: 17 July 2023

Published
17 July 2023
Modified
21 November 2024
KEV Added
—
Patch
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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 0.0014 33.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-28767 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 33.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

The configuration parser fails to sanitize user-controlled input in the Zyxel ATP series firmware versions 5.10 through 5.36, USG FLEX series firmware versions 5.00 through 5.36, USG FLEX 50(W) series firmware versions 5.10 through 5.36, USG20(W)-VPN series firmware versions 5.10…

more

through 5.36, and VPN series firmware versions 5.00 through 5.36. An unauthenticated, LAN-based attacker could leverage the vulnerability to inject some operating system (OS) commands into the device configuration data on an affected device when the cloud management mode is enabled.

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
5.00 — 5.37
zyxel
usg flex 100 firmware
5.00 — 5.37
zyxel
usg flex 100w firmware
5.00 — 5.37
zyxel
usg flex 200 firmware
5.00 — 5.37
zyxel
usg flex 50 firmware
5.00 — 5.37
zyxel
usg flex 500 firmware
5.00 — 5.37
zyxel
usg flex 50w firmware
5.00 — 5.37
zyxel
usg flex 700 firmware
5.00 — 5.37
zyxel
zywall vpn100 firmware
5.00 — 5.37
zyxel
zywall vpn2s firmware
5.00 — 5.37
+12 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