Critical severity · published Feb 18, 2026
CVE-2026-2329
Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow
9.8
CVSS
41.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)41.7% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GX
GXP1610 · Grandstream
through 1.0.7.80 · source: vendor
GX
GXP1615 · Grandstream
through 1.0.7.80 · source: vendor
GX
GXP1620 · Grandstream
through 1.0.7.80 · source: vendor
GX
GXP1625 · Grandstream
through 1.0.7.80 · source: vendor
GX
GXP1628 · Grandstream
through 1.0.7.80 · source: vendor
GX
GXP1630 · Grandstream
through 1.0.7.80 · source: vendor
GF
Gxp1610 Firmware · Grandstream
before 1.0.7.81 · source: NVD
GF
Gxp1615 Firmware · Grandstream
before 1.0.7.81 · source: NVD
GF
Gxp1620 Firmware · Grandstream
before 1.0.7.81 · source: NVD
GF
Gxp1625 Firmware · Grandstream
before 1.0.7.81 · source: NVD
GF
Gxp1628 Firmware · Grandstream
before 1.0.7.81 · source: NVD
GF
Gxp1630 Firmware · Grandstream
before 1.0.7.81 · source: NVD
In the news
VulnerabilityCritical
Critical Grandstream VoIP Bug Highlights SMB Security Blind Spot
CVE-2026-2329 allows unauthenticated root-level access to SMB phone infrastructure, so attackers can intercept calls, commit toll fraud, and impersonate users.
Feb 18, 2026·Dark Reading
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2329
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-2329
Product
https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf
Patch
https://github.com/rapid7/metasploit-framework/pull/20983
Vendor Advisory
https://psirt.grandstream.com/
Third Party Advisory
https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-overflow-in-grandstream-gxp1600-voip-phones-fixed