CVE-2026-2329 Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow

Critical 9.3 Published 18 Feb 2026 Updated 18 Feb 2026

Remote attackers can achieve root-level code execution on Grandstream GXP1600 series VoIP phones via an unauthenticated stack buffer overflow in the HTTP API.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-2329?

CVE-2026-2329 is a critical memory corruption vulnerability in Grandstream GXP1610, published on 18 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-121

Which versions are affected by CVE-2026-2329?

It affects 6 products.

Products include Grandstream Gxp1610 Firmware, Grandstream Gxp1615 Firmware, Grandstream Gxp1620 Firmware, Grandstream Gxp1625 Firmware, Grandstream Gxp1628 Firmware, Grandstream Gxp1630 Firmware.

How do I fix CVE-2026-2329?

No fix has been published for CVE-2026-2329 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-2329 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2329 exists.

Public exploit code: 1 Metasploit module and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-r4m3-cm43-fxrj.