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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