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CVE-2023-27991 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls	CVE	Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-78	Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')	[email protected]
CWE-78	Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')	[email protected]

Affected Products

Product	Versions
zyxel atp200 firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp200_firmware:::::::: Remediation No remediation found in references.
zyxel atp200	All versions
CPE cpe:2.3:h:zyxel:atp200:-:::::::* Remediation No remediation found in references.
zyxel atp100 firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp100_firmware:::::::: Remediation No remediation found in references.
zyxel atp100	All versions
CPE cpe:2.3:h:zyxel:atp100:-:::::::* Remediation No remediation found in references.
zyxel atp700 firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp700_firmware:::::::: Remediation No remediation found in references.
zyxel atp700	All versions
CPE cpe:2.3:h:zyxel:atp700:-:::::::* Remediation No remediation found in references.
zyxel atp500 firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp500_firmware:::::::: Remediation No remediation found in references.
zyxel atp500	All versions
CPE cpe:2.3:h:zyxel:atp500:-:::::::* Remediation No remediation found in references.
zyxel atp100w firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp100w_firmware:::::::: Remediation No remediation found in references.
zyxel atp100w	All versions
CPE cpe:2.3:h:zyxel:atp100w:-:::::::* Remediation No remediation found in references.
zyxel atp800 firmware	>= 4.32, < 5.36
CPE cpe:2.3:o:zyxel:atp800_firmware:::::::: Remediation No remediation found in references.
zyxel atp800	All versions
CPE cpe:2.3:h:zyxel:atp800:-:::::::* Remediation No remediation found in references.
zyxel usg flex 100 firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_100_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 100	All versions
CPE cpe:2.3:h:zyxel:usg_flex_100:-:::::::* Remediation No remediation found in references.
zyxel usg flex 50 firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_50_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 50	All versions
CPE cpe:2.3:h:zyxel:usg_flex_50:-:::::::* Remediation No remediation found in references.
zyxel usg flex 200 firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_200_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 200	All versions
CPE cpe:2.3:h:zyxel:usg_flex_200:-:::::::* Remediation No remediation found in references.
zyxel usg flex 500 firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_500_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 500	All versions
CPE cpe:2.3:h:zyxel:usg_flex_500:-:::::::* Remediation No remediation found in references.
zyxel usg flex 700 firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_700_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 700	All versions
CPE cpe:2.3:h:zyxel:usg_flex_700:-:::::::* Remediation No remediation found in references.
zyxel usg flex 100w firmware	>= 4.50, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_100w_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 100w	All versions
CPE cpe:2.3:h:zyxel:usg_flex_100w:-:::::::* Remediation No remediation found in references.
zyxel usg 20w-vpn firmware	>= 4.16, < 5.36
CPE cpe:2.3:o:zyxel:usg_20w-vpn_firmware:::::::: Remediation No remediation found in references.
zyxel usg 20w-vpn	All versions
CPE cpe:2.3:h:zyxel:usg_20w-vpn:-:::::::* Remediation No remediation found in references.
zyxel usg flex 50w firmware	>= 4.16, < 5.36
CPE cpe:2.3:o:zyxel:usg_flex_50w_firmware:::::::: Remediation No remediation found in references.
zyxel usg flex 50w	All versions
CPE cpe:2.3:h:zyxel:usg_flex_50w:-:::::::* Remediation No remediation found in references.
zyxel usg20-vpn firmware	>= 4.30, < 5.36
CPE cpe:2.3:o:zyxel:usg20-vpn_firmware:::::::: Remediation No remediation found in references.
zyxel usg20-vpn	All versions
CPE cpe:2.3:h:zyxel:usg20-vpn:-:::::::* Remediation No remediation found in references.
zyxel vpn100 firmware	>= 4.30, < 5.36
CPE cpe:2.3:o:zyxel:vpn100_firmware:::::::: Remediation No remediation found in references.
zyxel vpn100	All versions
CPE cpe:2.3:h:zyxel:vpn100:-:::::::* Remediation No remediation found in references.
zyxel vpn1000 firmware	>= 4.30, < 5.36
CPE cpe:2.3:o:zyxel:vpn1000_firmware:::::::: Remediation No remediation found in references.
zyxel vpn1000	All versions
CPE cpe:2.3:h:zyxel:vpn1000:-:::::::* Remediation No remediation found in references.
zyxel vpn300 firmware	>= 4.30, < 5.36
CPE cpe:2.3:o:zyxel:vpn300_firmware:::::::: Remediation No remediation found in references.
zyxel vpn300	All versions
CPE cpe:2.3:h:zyxel:vpn300:-:::::::* Remediation No remediation found in references.
zyxel vpn50 firmware	>= 4.30, < 5.36
CPE cpe:2.3:o:zyxel:vpn50_firmware:::::::: Remediation No remediation found in references.
zyxel vpn50	All versions
CPE cpe:2.3:h:zyxel:vpn50:-:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jun 13, 2023	Reanalysis	[email protected]
Jun 7, 2023	CPE Deprecation Remap	[email protected]
Jun 7, 2023	CPE Deprecation Remap	[email protected]
May 3, 2023	Initial Analysis	[email protected]

CVE-2023-27991 Details

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