TI-2026-03350 Aliases CVE-2026-3870 GHSA-r75m-m2v9-89vv

Buffer overflow in Zyxel VMG4005-B50B firmware

LOW 28CWE-120Published 2026-06-02 · Updated 2026-06-02

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

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 UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00168 6th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	VMG4005-B50B firmware	up to 5.13(ABRL.5.4)C0	—	No fix listed	CNA

VMG4005-B50B firmware VendorZyxel Affected up to 5.13(ABRL.5.4)C0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-06-02
Zyxel VMG4005-B50B firmware — zyxel.com/global/en/support/security-advisories/zyxel-secur…
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-03351 Buffer overflow in Zyxel VMG4005-B50B firmwarePriority LOW 28
Show all 2 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-3870
2026-10-03 Alias added: GHSA-r75m-m2v9-89vv

References

Advisory 1

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026

TI-2023-16198 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-16197 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-13281 OS command injection in Zyxel ZyWALL/USG series firmware KEVCVSS 3.1CRITICAL 9.8
TI-2023-12582 OS command injection in Zyxel NAS326 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2022-12682 OS command injection in Zyxel USG FLEX 100 firmware KEVCVSS 3.1CRITICAL 9.8
TI-2020-17772 Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with… KEVCVSS 3.1CRITICAL 9.8

See all 340 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences