CVE-2026-3871: Buffer Overflow
Published Jun 2, 2026
·Updated
A buffer overflow vulnerability in the UPnP DeletePortMapping() 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.
Affected Software
1 affected component
Zyxel Vmg4005-b50b Firmware<=5.13(ABRL.5.4)C0
Event History
Jun 2, 2026
CVE Published
via MITRE·02:04 AM
Data Sourced
via MITRE·02:04 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·03:16 AM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2026-3871?
The severity of CVE-2026-3871 is classified as medium with a score of 6.5.
2
What is the impact of CVE-2026-3871?
CVE-2026-3871 can lead to a temporary denial-of-service (DoS) condition affecting the UPnP function of the device.
3
How do I fix CVE-2026-3871?
To fix CVE-2026-3871, update your Zyxel VMG4005-B50B firmware to the latest version provided by Zyxel.
4
Which devices are affected by CVE-2026-3871?
CVE-2026-3871 specifically affects Zyxel VMG4005-B50B firmware versions up to and including 5.13(ABRL.5.4)C0.
5
What type of vulnerability is CVE-2026-3871?
CVE-2026-3871 is classified as a buffer overflow vulnerability.