CVE-2023-27991
Last modified
CVE-2023-27991 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.51% chance of exploitation in the next 30 days.
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Atp200 Firmware | >= 4.32, < 5.36 |
| Zyxel | Atp100 Firmware | >= 4.32, < 5.36 |
| Zyxel | Atp700 Firmware | >= 4.32, < 5.36 |
| Zyxel | Atp500 Firmware | >= 4.32, < 5.36 |
| Zyxel | Atp100w Firmware | >= 4.32, < 5.36 |
| Zyxel | Atp800 Firmware | >= 4.32, < 5.36 |
| Zyxel | Usg Flex 100 Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg Flex 50 Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg Flex 200 Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg Flex 500 Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg Flex 700 Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg Flex 100w Firmware | >= 4.50, < 5.36 |
| Zyxel | Usg 20w-Vpn Firmware | >= 4.16, < 5.36 |
| Zyxel | Usg Flex 50w Firmware | >= 4.16, < 5.36 |
| Zyxel | Usg20-Vpn Firmware | >= 4.30, < 5.36 |
| Zyxel | Vpn100 Firmware | >= 4.30, < 5.36 |
| Zyxel | Vpn1000 Firmware | >= 4.30, < 5.36 |
| Zyxel | Vpn300 Firmware | >= 4.30, < 5.36 |
| Zyxel | Vpn50 Firmware | >= 4.30, < 5.36 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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