CVE-2026-2329: Critical Unauthenticated Stack Buffer Overflow in Grandstream GXP1600 VoIP Phones (FIXED)


Rapid7 Labs conducted a zero-day research project against the Grandstream GXP1600 series of Voice over Internet Protocol (VoIP) phones.

This research resulted in the discovery of a critical unauthenticated stack-based buffer overflow vulnerability, CVE-2026-2329. A remote attacker can leverage CVE-2026-2329 to achieve unauthenticated remote code execution (RCE) with root privileges on a target device. A vendor supplied firmware update, version 1.0.7.81, is available to fully remediate CVE-2026-2329. The vulnerability is present in the device’s web-based API service, and is accessible in a default configuration.

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Source: Rapid7


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