Cyber Resilience

CVE-2023-27991

HighRCE

Published: 24 April 2023

Published
24 April 2023
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0228 85.0th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2023-27991 is a high-severity OS Command Injection (CWE-78) vulnerability in Zyxel Atp200 Firmware. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 15.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35,…

more

and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker to execute some OS commands remotely.

CWE(s)
CWE-78

Related Threats

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

Affected Assets

zyxel
atp200 firmware
4.32 — 5.36
zyxel
atp100 firmware
4.32 — 5.36
zyxel
atp700 firmware
4.32 — 5.36
zyxel
atp500 firmware
4.32 — 5.36
zyxel
atp100w firmware
4.32 — 5.36
zyxel
atp800 firmware
4.32 — 5.36
zyxel
usg flex 100 firmware
4.50 — 5.36
zyxel
usg flex 50 firmware
4.50 — 5.36
zyxel
usg flex 200 firmware
4.50 — 5.36
zyxel
usg flex 500 firmware
4.50 — 5.36
+9 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