CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2023-27991
High (8.8) in zyxel. EPSS 1.5% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.5% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
- CWE
- CWE-78
- Published
- Modified
- Record from
- the NVD, synced
Affected
- zyxel:atp100_firmware
- zyxel:atp100w_firmware
- zyxel:atp200_firmware
- zyxel:atp500_firmware
- zyxel:atp700_firmware
- zyxel:atp800_firmware
- zyxel:usg20-vpn_firmware
- zyxel:usg_20w-vpn_firmware
- zyxel:usg_flex_100_firmware
- zyxel:usg_flex_100w_firmware
- zyxel:usg_flex_200_firmware
- zyxel:usg_flex_500_firmware
- zyxel:usg_flex_50_firmware
- zyxel:usg_flex_50w_firmware
- zyxel:usg_flex_700_firmware
- zyxel:vpn1000_firmware
- zyxel:vpn100_firmware
- zyxel:vpn300_firmware
- zyxel:vpn50_firmware
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