CVE: CVE-2023-27989
Summary
Zyxel has released patches for some 4G LTE and 5G NR outdoor routers affected by a buffer overflow vulnerability. Users are advised to install them for optimal protection.
What are the vulnerabilities?
A buffer overflow vulnerability in the CGI program of some Zyxel 4G LTE and 5G NR outdoor routers could allow a remote authenticated attacker to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.
What versions are vulnerable—and what should you do?
After a thorough investigation, we’ve identified the vulnerable products that are within their vulnerability support period and released patches to address the vulnerability, as shown in the table below.
| Affected model | Affected version | Patch availability |
| LTE7480-M804 | V1.00(ABRA.6)C0 and earlier | V1.00(ABRA.7)C0 |
| LTE7490-M904 | V1.00(ABQY.5)C0 and earlier | V1.00(ABQY.6)C0 |
| NR7101 | V1.00(ABUV.7)C0 and earlier | V1.00(ABUV.8)C0 |
| Nebula NR7101 | V1.15(ACCC.3)C0 and earlier |
Hotfix available: V1.15(ACCC.3)C0 hotfix |
Got a question?
Please contact your local service rep or visit Zyxel’s Community for further information or assistance.
Acknowledgment
Thanks to Chengfeng Ye, Prism Research Group - cse hkust for reporting the issue to us.
Revision history
2023-6-6: Initial release.