CVE-2023-27989

6.5 mediumEPSS 1.0%

Medium (6.5) in zyxel. EPSS 1.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-31)
CWE: CWE-120
Published: 2023-06-05
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zyxel:lte7480-m804_firmware
zyxel:lte7490-m904_firmware
zyxel:nebula_nr7101_firmware
zyxel:nr7101_firmware

References

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

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