CVE-2023-28771
9.8 · CRITICAL Actively ExploitedOverview
CVE-2023-28771 is a critical-severity vulnerability affecting zyxel atp100_firmware. It was published on April 25, 2023 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from zyxel. Update atp100_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zyxel | atp100_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | atp100w_firmware | >= 4.60, < 5.35 | Affected |
| zyxel | atp200_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | atp500_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | atp700_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | atp800_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | usg_flex_100_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | usg_flex_100w_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | usg_flex_200_firmware | >= 4.60, < 5.36 | Affected |
| zyxel | usg_flex_50_firmware | >= 4.60, < 5.36 | Affected |
References
Frequently Asked Questions
What is CVE-2023-28771?
CVE-2023-28771 is a critical-severity vulnerability affecting zyxel atp100_firmware. It was published on April 25, 2023 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2023-28771?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2023-28771?
Check the references section for vendor advisories and patches from zyxel. Update atp100_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2023-28771?
CyberStrike's AI-powered security agents can automatically detect CVE-2023-28771 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
Related CRITICAL CVEs from 2023
View all →Out-of-bounds write vulnerability in Remote Desktop Functionality in Synology VPN Plus Server before
Due to improper input sanitization of user-controlled input in SAP BusinessObjects Business Intellig
InHand Networks InRouter 302, prior to version IR302 V3.5.56, and InRouter 615, prior to version In
InHand Networks InRouter 302, prior to version IR302 V3.5.56, and InRouter 615, prior to version In
Sewio’s Real-Time Location System (RTLS) Studio version 2.0.0 up to and including version 2.6.2 cont
Baicells Nova 227, Nova 233, and Nova 243 LTE TDD eNodeB devices with firmware through RTS/RTD 3.7.1
Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsin
IBM Tivoli Workload Scheduler 9.4, 9.5, and 10.1 is vulnerable to an XML External Entity Injection (
Dompdf is an HTML to PDF converter written in php. Due to the difference in the attribute parser of
A vulnerability has been identified in COMOS V10.2 (All versions), COMOS V10.3.3.1 (All versions < V
Due to improper artibute filtering in the sequalize js library, can a attacker peform SQL injections
Sequelize is a Node.js ORM tool. In versions prior to 6.19.1 a SQL injection exploit exists related