CVE-2023-27991

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.
OS Command Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
ZyxelCNA
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVEADP
---
---
CISA-ADPADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 76%
VendorProductVersion
zyxelatp200_firmware
4.32 ≤
𝑥
< 5.36
zyxelatp100_firmware
4.32 ≤
𝑥
< 5.36
zyxelatp700_firmware
4.32 ≤
𝑥
< 5.36
zyxelatp500_firmware
4.32 ≤
𝑥
< 5.36
zyxelatp100w_firmware
4.32 ≤
𝑥
< 5.36
zyxelatp800_firmware
4.32 ≤
𝑥
< 5.36
zyxelusg_flex_100_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_flex_50_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_flex_200_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_flex_500_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_flex_700_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_flex_100w_firmware
4.50 ≤
𝑥
< 5.36
zyxelusg_20w-vpn_firmware
4.16 ≤
𝑥
< 5.36
zyxelusg_flex_50w_firmware
4.16 ≤
𝑥
< 5.36
zyxelusg20-vpn_firmware
4.30 ≤
𝑥
< 5.36
zyxelvpn100_firmware
4.30 ≤
𝑥
< 5.36
zyxelvpn1000_firmware
4.30 ≤
𝑥
< 5.36
zyxelvpn300_firmware
4.30 ≤
𝑥
< 5.36
zyxelvpn50_firmware
4.30 ≤
𝑥
< 5.36
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls