CVE-2022-27646
Published: 29 March 2023
Summary
CVE-2022-27646 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Netgear R6400 Firmware. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 5.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2022-27646 is a stack-based buffer overflow vulnerability, tracked as CWE-121, that affects the circled daemon on NETGEAR R6700v3 routers running firmware version 1.0.4.120_10.0.91. The flaw is triggered when the daemon processes a crafted circleinfo.txt file, enabling an attacker to overwrite memory on the stack and execute arbitrary code.
The vulnerability can be exploited by network-adjacent attackers who first bypass the router's existing authentication mechanism. Successful exploitation grants code execution in the context of the root user, with a CVSS 3.1 base score of 8.8 reflecting the combination of adjacent-network access, low attack complexity, and high impact on confidentiality, integrity, and availability.
NETGEAR's security advisory PSV-2021-0324 and the corresponding Zero Day Initiative report ZDI-22-523 address the issue and direct users to updated firmware that resolves the buffer overflow. The EPSS score has remained flat at 0.1282 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-32147
Vulnerability details
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700v3 1.0.4.120_10.0.91 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the circled daemon.…
more
A crafted circleinfo.txt file can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-15879.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.