CVE-2023-27991

🗓️ 24 Apr 2023 18:15:09Reported by [email protected]Type

Post-authentication command injection vulnerability in Zyxel ATP, USG FLEX, and USG20(W)-VPN series firmware versions 4.32-5.3

Reporter	Title	Published	Views	Family All 15
BDU FSTEC	ZyXEL USG Network Device Arbitrary Script Execution	19 Dec 202300:00	–	bdu_fstec
Circl	CVE-2023-27991	24 Apr 202322:19	–	circl
CNNVD	Zyxel ATP 操作系统命令注入漏洞	24 Apr 202300:00	–	cnnvd
CVE	CVE-2023-27991	24 Apr 202300:00	–	cve
Cvelist	CVE-2023-27991	24 Apr 202300:00	–	cvelist
EUVD	EUVD-2023-31716	3 Oct 202520:07	–	euvd
NCSC	Vulnerabilities fixed in Zyxel Firewalls and Access Points	25 Apr 202300:00	–	ncsc
osv_cve	CVE-2023-27991	24 Apr 202318:15	–	osv_cve
Prion	Command injection	24 Apr 202318:15	–	prion
Positive Technologies	PT-2023-7789 · Zyxel · Zyxel Usg Flex Series +4	24 Apr 202300:00	–	ptsecurity

NVD

Node

AND

zyxel atp200_firmwareRange4.32–5.36

zyxel atp200Match-

Node

AND

zyxel atp100_firmwareRange4.32–5.36

zyxel atp100Match-

Node

AND

zyxel atp700_firmwareRange4.32–5.36

zyxel atp700Match-

Node

AND

zyxel atp500_firmwareRange4.32–5.36

zyxel atp500Match-

Node

AND

zyxel atp100w_firmwareRange4.32–5.36

zyxel atp100wMatch-

Node

AND

zyxel atp800_firmwareRange4.32–5.36

zyxel atp800Match-

Node

AND

zyxel usg_flex_100_firmwareRange4.50–5.36

zyxel usg_flex_100Match-

Node

AND

zyxel usg_flex_50_firmwareRange4.50–5.36

zyxel usg_flex_50Match-

Node

AND

zyxel usg_flex_200_firmwareRange4.50–5.36

zyxel usg_flex_200Match-

Node

AND

zyxel usg_flex_500_firmwareRange4.50–5.36

zyxel usg_flex_500Match-

Node

AND

zyxel usg_flex_700_firmwareRange4.50–5.36

zyxel usg_flex_700Match-

Node

AND

zyxel usg_flex_100w_firmwareRange4.50–5.36

zyxel usg_flex_100wMatch-

Node

AND

zyxel usg_20w-vpn_firmwareRange4.16–5.36

zyxel usg_20w-vpnMatch-

Node

AND

zyxel usg_flex_50w_firmwareRange4.16–5.36

zyxel usg_flex_50wMatch-

Node

AND

zyxel usg20-vpn_firmwareRange4.30–5.36

zyxel usg20-vpnMatch-

Node

AND

zyxel vpn100_firmwareRange4.30–5.36

zyxel vpn100Match-

Node

AND

zyxel vpn1000_firmwareRange4.30–5.36

zyxel vpn1000Match-

Node

AND

zyxel vpn300_firmwareRange4.30–5.36

zyxel vpn300Match-

Node

AND

zyxel vpn50_firmwareRange4.30–5.36

zyxel vpn50Match-

Source	Link
zyxel	www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls

17 Jun 2026 05:46Current

9Critical risk

Vulners AI Score9

CVSS 3.18.8

EPSS0.01453

SSVC

CWE-78