TI-2023-09060 Aliases CVE-2023-22922 GHSA-gchg-8x7r-rq44

Buffer overflow in Zyxel NBG-418N v2 firmware

MEDIUM 41CWE-120Published 2023-05-01 · Updated 2025-01-30

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

A buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote unauthenticated attacker to cause DoS conditions by sending crafted packets if Telnet is enabled on a vulnerable device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00933 60th percentileScored 2026-11-07

Fix Fixed NBG-418N v2 firmware (Zyxel): V1.00(AARP.14)C0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zyxel	NBG-418N v2 firmware	before V1.00(AARP.14)C0	V1.00(AARP.14)C0	Patch available	CNA

NBG-418N v2 firmware VendorZyxel Affected before V1.00(AARP.14)C0 Fixed in V1.00(AARP.14)C0 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:zyxel:nbg-418n_firmware::::::::	up to 1.00\(aarp.13\)c0	Vulnerable	Zyxel
cpe:2.3:h:zyxel:nbg-418n:v2:::::::*	v2	Running on	Zyxel

cpe:2.3:o:zyxel:nbg-418n_firmware:*:*:*:*:*:*:*:* Versions up to 1.00\(aarp.13\)c0 Vulnerable ·Zyxel
cpe:2.3:h:zyxel:nbg-418n:v2:*:*:*:*:*:*:* Versions v2 Running on ·Zyxel

Remediation

Fix · CNA NBG-418N v2 firmware (Zyxel) Fixed in V1.00(AARP.14)C0

Timeline

2026-10-02 Threatist record created from CVE-2023-22922
2026-10-03 Alias added: GHSA-gchg-8x7r-rq44

References

Patch 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-nbg-418n-v2-home-router

TI-2019-04755 Zyxel NBG-418N v2 v1.00(AAXM.4)C0 devices allow login.cgi CSRF. CVSS 3.0HIGH 8.8
TI-2015-06055 The web administration interface on ZyXEL NBG-418N devices with firmware 1.00(AADZ.3)C0… CVSS 3.0HIGH 8.1
TI-2015-06056 Cross-site request forgery (CSRF) vulnerability on ZyXEL NBG-418N devices with firmware… CVSS 3.0HIGH 8.0
TI-2023-09059 Cross-site scripting in Zyxel NBG-418N v2 firmware CVSS 3.1HIGH 7.5
TI-2023-09061 A format string vulnerability in a binary of the Zyxel NBG-418N v2 firmware versions… CVSS 3.1MEDIUM 6.5
TI-2022-22407 Cross-site scripting in Zyxel NBG-418N v2 firmware CVSS 3.1MEDIUM 6.1

See all 7 →

Sources

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