CVE-2023-28771

CRITICALCISA KEV

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/25/2023

Last Modified10/27/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorZyxel

ProductMultiple Firewalls

Vulnerability NameZyxel Multiple Firewalls OS Command Injection Vulnerability

KEV Date Added2023-05-31

Remediation Due Date2023-06-21

Ransomware UseUnknown

Affected Products

zyxel:atp100zyxel:atp100_firmwarezyxel:atp100wzyxel:atp100w_firmwarezyxel:atp200zyxel:atp200_firmwarezyxel:atp500zyxel:atp500_firmwarezyxel:atp700zyxel:atp700_firmwarezyxel:atp800zyxel:atp800_firmwarezyxel:usg_flex_100zyxel:usg_flex_100_firmwarezyxel:usg_flex_100wzyxel:usg_flex_100w_firmwarezyxel:usg_flex_200zyxel:usg_flex_200_firmwarezyxel:usg_flex_50zyxel:usg_flex_500zyxel:usg_flex_500_firmwarezyxel:usg_flex_50_firmwarezyxel:usg_flex_50wzyxel:usg_flex_50w_firmwarezyxel:usg_flex_700zyxel:usg_flex_700_firmwarezyxel:vpn100zyxel:vpn1000zyxel:vpn1000_firmwarezyxel:vpn100_firmwarezyxel:vpn300zyxel:vpn300_firmwarezyxel:vpn50zyxel:vpn50_firmwarezyxel:zywall_usg_100zyxel:zywall_usg_100_firmwarezyxel:zywall_usg_310zyxel:zywall_usg_310_firmware

Weaknesses (CWE)

CWE-78CWE-78

References

http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html(security@zyxel.com.tw)

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls(security@zyxel.com.tw)

http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28771(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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