CVE-2023-27989

Name: CVE-2023-27989
Creator: NVD / NIST
Published: 2023-06-05T12:15:09.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2023-27989 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A buffer overflow vulnerability in the CGI program of the Zyxel NR7101 firmware versions prior to V1.00(ABUV.8)C0 could allow a remote authenticated attacker to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

A buffer overflow vulnerability in the CGI program of the Zyxel NR7101 firmware versions prior to V1.00(ABUV.8)C0 could allow a remote authenticated attacker to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.02%

58.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zyxel	Lte7480-M804 Firmware	<= 1.00\(abra.6\)c0
Zyxel	Lte7490-M904 Firmware	<= 1.00\(abqy.5\)c0
Zyxel	Nr7101 Firmware	<= 1.00\(abuv.7\)c0
Zyxel	Nebula Nr7101 Firmware	<= 1.15\(accc.3\)c0

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-4g-lte-and-5g-nr-outdoor-routersPatch, Third Party Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-4g-lte-and-5g-nr-outdoor-routersPatch, Third Party Advisory

Timeline

Published: Jun 5, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27989?

How severe is CVE-2023-27989?

CVE-2023-27989 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27989?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27989?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST