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9.8
CRITICAL CVSS 3.1
CVE-2026-2329
Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow
Overview
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.

Details
INFO

Published Date :

Feb. 18, 2026, 3:18 p.m.

Last Modified :

Feb. 20, 2026, 8:57 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-2329 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Grandstream gxp1610_firmware
2 Grandstream gxp1615_firmware
3 Grandstream gxp1620_firmware
4 Grandstream gxp1625_firmware
5 Grandstream gxp1628_firmware
6 Grandstream gxp1630_firmware
7 Grandstream gxp1610
8 Grandstream gxp1615
9 Grandstream gxp1620
10 Grandstream gxp1625
11 Grandstream gxp1628
12 Grandstream gxp1630
: Total Affected Vendor : 1 | Products : 12
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL [email protected]
CVSS 4.0 CRITICAL 9974b330-7714-4307-a722-5648477acda7
CVSS 4.0 CRITICAL [email protected]
Solution
Patch the stack-based buffer overflow vulnerability in the HTTP API endpoint.
  • Update the device firmware to the latest version.
  • Apply vendor patches for the affected HTTP API.
  • Restrict access to the /cgi-bin/api.values.get endpoint.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-2329.

URL Resource
https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf Product Release Notes
https://github.com/rapid7/metasploit-framework/pull/20983 VDB Entry Patch
https://psirt.grandstream.com/ Vendor Advisory
https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-overflow-in-grandstream-gxp1600-voip-phones-fixed Third Party Advisory VDB Entry
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-2329 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-2329 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-2329 vulnerability anywhere in the article.

  • CybersecurityNews
Metasploit Adds New Modules Targeting Linux RC4, BeyondTrust, and Registry Persistence

Metasploit Adds New Modules Targeting Linux RC4 The latest Metasploit update, released on February 27, 2026, brings significant firepower to security professionals and penetration testers. The release ... Read more

Published Date: Feb 28, 2026 (2 weeks, 1 day ago)
  • CybersecurityNews
PoC Exploit Released for Grandstream GXP1600 VoIP Phones RCE Vulnerability

Grandstream GXP1600 VoIP Phones RCE Vulnerability A critical zero-day vulnerability, tracked as CVE-2026-2329, is affecting Grandstream’s GXP1600 series VoIP desk phones. The issue is an unauthenticat ... Read more

Published Date: Feb 23, 2026 (2 weeks, 6 days ago)
  • Help Net Security
Week in review: Firmware-level Android backdoor found on tablets, Dell zero-day exploited since 2024

Here’s an overview of some of last week’s most interesting news, articles, interviews and videos: Security at AI speed: The new CISO reality The CISO role has changed significantly over the past decad ... Read more

Published Date: Feb 22, 2026 (3 weeks ago)
  • CybersecurityNews
Grandstream VoIP Phones Vulnerability Allows Attackers to Gain Root Privileges

VoIP desk phones are trusted devices, but many are managed like office furniture. A newly disclosed flaw in Grandstream phones shows how a simple network-facing bug can turn a handset into an entry po ... Read more

Published Date: Feb 20, 2026 (3 weeks, 2 days ago)
  • Daily CyberSecurity
PoC Publicly Disclosed: Critical Grandstream VoIP Flaw (CVSS 9.3) Grants Stealthy Root Access

If your office desks are equipped with Grandstream GXP1600 series phones, you might want to pause the hold music and update your firmware immediately. A severe zero-day vulnerability has been uncovere ... Read more

Published Date: Feb 20, 2026 (3 weeks, 3 days ago)
  • Help Net Security
Bug in widely used VoIP phones allows stealthy network footholds, call interception (CVE-2026-2329)

A critical security vulnerability (CVE-2026-2329) in Grandstream VoIP phones could let hackers remotely take full control of the devices and even intercept calls, Rapid7 researchers discovered. “The v ... Read more

Published Date: Feb 19, 2026 (3 weeks, 3 days ago)
  • The Hacker News
Grandstream GXP1600 VoIP Phones Exposed to Unauthenticated Remote Code Execution

Cybersecurity researchers have disclosed a critical security flaw in the Grandstream GXP1600 series of VoIP phones that could allow an attacker to seize control of susceptible devices. The vulnerabili ... Read more

Published Date: Feb 18, 2026 (3 weeks, 4 days ago)
  • security.nl
Lek in Grandstream VoiP-telefoons laat aanvaller gesprekken afluisteren

Een kritieke kwetsbaarheid in VoIP-telefoons van fabrikant Grandstream maakt het mogelijk voor een ongeauthenticeerde remote aanvaller om als root code op kwetsbare toestellen uit te voeren. Vervolgen ... Read more

Published Date: Feb 18, 2026 (3 weeks, 4 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-2329 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Feb. 20, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1610_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1610:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1615_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1615:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1620_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1620:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1625_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1625:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1628_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1628:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:grandstream:gxp1630_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.7.81 OR cpe:2.3:h:grandstream:gxp1630:-:*:*:*:*:*:*:*
    Added Reference Type Rapid7, Inc.: https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf Types: Product, Release Notes
    Added Reference Type Rapid7, Inc.: https://github.com/rapid7/metasploit-framework/pull/20983 Types: Patch, VDB Entry
    Added Reference Type Rapid7, Inc.: https://psirt.grandstream.com/ Types: Vendor Advisory
    Added Reference Type Rapid7, Inc.: https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-overflow-in-grandstream-gxp1600-voip-phones-fixed Types: Third Party Advisory, VDB Entry
  • New CVE Received by [email protected]

    Feb. 18, 2026

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 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
    Added CWE CWE-121
    Added Reference https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf
    Added Reference https://github.com/rapid7/metasploit-framework/pull/20983
    Added Reference https://psirt.grandstream.com/
    Added Reference https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-overflow-in-grandstream-gxp1600-voip-phones-fixed
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.3
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact