CVE & CISA-KEV Catalog

CVE-2023-27991

HIGHEPSS 71th pctl
8.8
CVSS v3
NVD

Description

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

CWE-78OS Command Injection

How to fix

Remediation Available
atp100 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
atp100w firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
atp200 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
atp500 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
atp700 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
atp800 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg20-vpn firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg 20w-vpn firmwareNVD
Affected:>= 4.16, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 100 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 100w firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 200 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 500 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 50 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 50w firmwareNVD
Affected:>= 4.16, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
usg flex 700 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
vpn1000 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
vpn100 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
vpn300 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD
vpn50 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-27991derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.51%probability of exploitation in 30 days
71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-1498Critical9.8100%KEVFix
CVE-2014-6271Critical9.8100%KEVFix
CVE-2019-16920Critical9.8100%KEV-
CVE-2022-44877Critical9.8100%KEVFix
CVE-2020-8515Critical9.8100%KEV-
CVE-2020-9054Critical9.8100%KEVFix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.