CVE-2021-27251 Explained : Impact and Mitigation
Discover the impact of CVE-2021-27251, a high-severity vulnerability in NETGEAR Nighthawk R7800 routers allowing network-adjacent attackers to execute arbitrary code without authentication.
A vulnerability in NETGEAR Nighthawk R7800 routers allows network-adjacent attackers to execute arbitrary code without authentication, posing a significant security risk.
Understanding CVE-2021-27251
This CVE identifies a flaw in the handling of firmware updates in NETGEAR Nighthawk R7800 routers, enabling attackers to exploit the vulnerability and execute code on affected devices.
What is CVE-2021-27251?
The vulnerability in CVE-2021-27251 permits network-adjacent threat actors to run arbitrary code on impacted NETGEAR Nighthawk R7800 devices without the need for authentication. It stems from an insecure protocol fallback during firmware updates.
The Impact of CVE-2021-27251
With a CVSS base score of 8.8 (High), this CVE presents severe consequences. Attackers can exploit the vulnerability to execute code with high confidentiality, integrity, and availability impact, potentially compromising the affected systems.
Technical Details of CVE-2021-27251
This section delves into specific technical aspects of the CVE.
Vulnerability Description
The vulnerability arises due to a flaw in the firmware update process, allowing threat actors to leverage an insecure protocol to execute arbitrary code as root on NETGEAR Nighthawk R7800 routers.
Affected Systems and Versions
NETGEAR Nighthawk R7800 routers running version 1.0.2.76 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit the insecure firmware update handling to deliver and execute malicious code on the affected devices.
Mitigation and Prevention
To safeguard against CVE-2021-27251, immediate action and long-term security measures are vital.
Immediate Steps to Take
Users should update their NETGEAR Nighthawk R7800 routers to a secure firmware version and ensure network security controls are in place to prevent unauthorized access.
Long-Term Security Practices
Implementing secure coding practices, conducting regular security audits, and staying informed about firmware updates and security advisories are essential for long-term security.
Patching and Updates
NETGEAR has released patches to address the vulnerability. Users are advised to promptly apply these updates to secure their devices.