CVE WatchJul 22, 2026

CVE-2026-3871

A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 cou

CVSS

6.5

Medium

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jun 2, 2026 · Last modified: Jul 22, 2026 · CWE-120

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-052026-08-02

Technical description

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.

Official references

www.zyxel.comhttps://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

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-66945.5 MED

—

——0A flaw was found in GIMP's file-png plugin. A remote attacker can exploit this by crafting a malicious Animated Portable Network Graphics (APNG) image containing an oversized tRNS chunk. This can lead to a stack-based buffer overflow (CWE-121), causing the file-png plugin to crash and resulting in a Denial of Service (DoS) for the user.6h CVE-2026-183214.7 MED

0.3%

——0Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd3d CVE-2026-118858.4 HIG

1.1%

——0IBM PowerVM Hypervisor FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H1 A carefully crafted OS hypervisor call can cause the PowerVM hypervisor to crash or compromise OS memory integrity.4d CVE-2026-647679.8 CRI

36.6%

——11A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A remote attacker may be able to cause unexpected system termination or corrupt kernel memory.6d CVE-2026-647477.8 HIG

4.0%

——1A buffer overflow was addressed with improved size validation. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to execute arbitrary code with kernel privileges.5d CVE-2026-647225.5 MED

4.4%

——1A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6. Processing a 3D model may result in disclosure of process memory.4d