CVE-2021-27251
8.8 · HIGHOverview
CVE-2021-27251 is a high-severity vulnerability affecting netgear br200_firmware. It was published on April 14, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. The issue results from a fallback to a insecure protocol to deliver updates. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12308.
Remediation
Check the references section for vendor advisories and patches from netgear. Update br200_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| netgear | br200_firmware | >= 0, < 5.10.0.5 | Affected |
| netgear | br500_firmware | >= 0, < 5.10.0.5 | Affected |
| netgear | d7800_firmware | >= 0, < 1.0.1.60 | Affected |
| netgear | ex6100v2_firmware | >= 0, < 1.0.1.98 | Affected |
| netgear | ex6150_firmware | >= 0, < 1.0.1.98 | Affected |
| netgear | ex6250_firmware | >= 0, < 1.0.0.134 | Affected |
| netgear | ex6400_firmware | >= 0, < 1.0.2.158 | Affected |
| netgear | ex6400v2_firmware | >= 0, < 1.0.0.134 | Affected |
| netgear | ex6410_firmware | >= 0, < 1.0.0.134 | Affected |
| netgear | ex6420_firmware | >= 0, < 1.0.0.134 | Affected |
| netgear | ex7300_firmware | >= 0, < 1.0.2.158 | Affected |
References
Frequently Asked Questions
What is CVE-2021-27251?
CVE-2021-27251 is a high-severity vulnerability affecting netgear br200_firmware. It was published on April 14, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2021-27251?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-27251?
Check the references section for vendor advisories and patches from netgear. Update br200_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-27251?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-27251 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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