Critical severity9.8CISA KEVNVD Advisory· Published Apr 25, 2023· Updated Jun 17, 2026
CVE-2023-28771
CVE-2023-28771
Description
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
29- cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*Range: >=4.60,<5.36
cpe:2.3:o:zyxel:zywall_usg_100_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:zywall_usg_100_firmware:*:*:*:*:*:*:*:*range: >=4.60,<4.73
- cpe:2.3:o:zyxel:zywall_usg_100_firmware:4.73:-:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_usg_310_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:zywall_usg_310_firmware:*:*:*:*:*:*:*:*range: >=4.60,<4.73
- cpe:2.3:o:zyxel:zywall_usg_310_firmware:4.73:-:*:*:*:*:*:*
4.60 - 5.35+ 1 more
- (no CPE)range: 4.60 - 5.35
- (no CPE)range: 4.60 through 5.35
4.60 - 4.73+ 1 more
- (no CPE)range: 4.60 - 4.73
- (no CPE)range: 4.60 through 4.73
4.60 - 5.35+ 1 more
- (no CPE)range: 4.60 - 5.35
- (no CPE)range: 4.60 through 5.35
4.60 - 5.35+ 1 more
- (no CPE)range: 4.60 - 5.35
- (no CPE)range: 4.60 through 5.35
Patches
Vulnerability mechanics
References
3- packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.htmlnvdExploitThird Party Advisory
- www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewallsnvdVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
News mentions
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