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CVE-2021-31802

8.8 · HIGH

NETGEAR R7000 1.0.11.116 devices have a heap-based Buffer Overflow that is exploitable from the local network without authentication.

Published Apr 26, 2021CWE-787EPSS 14.18%

Overview

CVE-2021-31802 is a high-severity vulnerability. It was published on April 26, 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

NETGEAR R7000 1.0.11.116 devices have a heap-based Buffer Overflow that is exploitable from the local network without authentication. The vulnerability exists within the handling of an HTTP request. An attacker can leverage this to execute code as root. The problem is that a user-provided length value is trusted during a backup.cgi file upload. The attacker must add a \n before the Content-Length header.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refssd-disclosure.com/ssd-advisory-netgear-nighthawk-r7000-httpd-preauth-rce/Refwww.netgear.com/about/security/Refssd-disclosure.com/ssd-advisory-netgear-nighthawk-r7000-httpd-preauth-rce/Refwww.netgear.com/about/security/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-31802?

CVE-2021-31802 is a high-severity vulnerability. It was published on April 26, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-31802?

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-2021-31802?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2021-31802?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-31802 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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