High severity8.8NVD Advisory· Published Apr 24, 2023· Updated Jun 17, 2026
CVE-2023-27991
CVE-2023-27991
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
294.16 through 5.35+ 1 more
- (no CPE)range: 4.16 through 5.35
- cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*range: >=4.30,<5.36
- Range: 4.16 through 5.35
- cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*Range: >=4.50,<5.36
cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*range: >=4.16,<5.36
- (no CPE)range: 4.16 - 5.35
- Range: 4.50 - 5.35
- Range: 4.30 - 5.35
- Range: 4.32 - 5.35
- Range: 4.16 - 5.35
- Range: 4.32 through 5.35
- Range: 4.50 through 5.35
- Range: 4.30 through 5.35
Patches
Vulnerability mechanics
References
1News mentions
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