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CVE-2022-27646 is a stack-based buffer overflow vulnerability in the circled daemon of NETGEAR R6700v3 routers running firmware version 1.0.4.120_10.0.91. The vulnerability is triggered by processing a crafted circleinfo.txt file, which can overflow a fixed-length stack buffer. Although authentication is nominally required, the authentication mechanism can be bypassed, allowing a network-adjacent attacker to exploit the flaw and execute arbitrary code as root.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a comprehensive proof-of-concept (PoC) exploit for CVE-2022-27646, a stack buffer overflow in the circled binary of NETGEAR R6700v3 routers (firmware 1.0.4.120_10.0.91). The exploit leverages the router's insecure update mechanism, which fetches circleinfo.txt and database.bin from remote servers without certificate validation. By redirecting these requests to an attacker-controlled HTTP server (implemented in Python as server/circled.server.py), a maliciously crafted circleinfo.txt file is delivered, triggering a stack buffer overflow when parsed by the circled binary. The repository includes scripts and documentation for emulating the target environment (QEMU, chroot, NVRAM emulation), patching anti-debugging features, and using symbolic execution (Morion) to analyze and craft ROP chains. The exploit can execute arbitrary commands or spawn a reverse shell as root. The structure includes code for the HTTP server, payload generation, binary patching, and detailed documentation for setup, emulation, tracing, symbolic execution, vulnerability analysis, and exploitation. Key endpoints are the HTTP URLs for payload delivery and the local files written on the target. The exploit is operational and demonstrates full remote code execution capabilities.
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