CVE-2026-2329

Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow

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.

Affected

Grandstream · GXP1610 · GXP1615 · GXP1620 · GXP1625 · GXP1628 · GXP1630

CVSS v4.0 RAPID7

9.3 CRITICALCVSS: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

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

41.72% chance of exploitation in the next 30 days, 99th percentile

Published

2026-02-18

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/grandstream_gxp1600_u…

Security advisories

• https://psirt.grandstream.com
• https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-o…
• rapid7/metasploit-framework/pull/20983
• https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf

References

• CVE Record
• NVD entry