PT-2023-1558 · Zyxel · Zyxel Nr7101

Published 2023-01-10 · Updated 2023-01-19 · CVE-2022-43389

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Zyxel NR7101 firmware versions prior to V1.15(ACCC.3)C0

Description The issue is caused by a buffer overflow vulnerability in the library of the web server. This could allow an unauthenticated attacker to execute some OS commands or cause denial-of-service (DoS) conditions on a vulnerable device.

Recommendations For Zyxel NR7101 firmware versions prior to V1.15(ACCC.3)C0, update to V1.15(ACCC.3)C0 or later to resolve the issue. As a temporary workaround, consider restricting access to the web server library to minimize the risk of exploitation.

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

BDU:2023-01023

CVE-2022-43389

Affected Products

Zyxel Nr7101

References · 7

• https://zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-buffer-overflow-vulnerabilities-of-cpe-fiber-onts-and-wifi-extenders · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-01023 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2022-43389 · Security Note
• https://osv.dev/vulnerability/CVE-2022-43389 · Vendor Advisory
• https://t.me/pentestingnews/32005 · Telegram Post
• https://t.me/cibsecurity/56332 · Telegram Post
• https://t.me/cvenotify/42367 · Telegram Post