CVE-2022-43389: zyxel ep240p_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2022-43389 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in zyxel ep240p_firmware. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.2% of scored vulnerabilities.

Timeline

1. 11-01-2023
   PublishedVulnerability first disclosed.
2. 09-04-2025
   Last modifiedVulnerability information updated.

Description

A buffer overflow vulnerability in the library of the web server in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an unauthenticated attacker to execute some OS commands or to cause denial-of-service (DoS) conditions on a vulnerable device.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.