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CVE-2026-2329

CriticalPublished

Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow

Published: Feb 18, 2026
Updated: Feb 18, 2026
Assigning CNA: rapid7
Evidence observed: Aug 24, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

40.6%

Moderate · next 30 days

Percentile: 98.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

An unauthenticated stack-based buffer overflow vulnerability exists in the HTTP API endpoint /cgi-bin/api.values.get. A remote attacker can leverage this vulnerability to achieve unauthenticated remote code execution (RCE) with root privileges on a target device. The vulnerability affects all six device models in the series: GXP1610, GXP1615, GXP1620, GXP1625, GXP1628, and GXP1630.

Sources

grandstream-cve-2026-2329-analysisResearch
Defensive vulnerability-research project comparing vulnerable and patched Grandstream GXP1600 firmware for CVE-2026-2329, using SquashFS extraction, Ghidra reverse engineering, and ARM ELF tracing to document the vendor's remediation without weaponized ex

Responsible use

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