What is CVE-2021-27255?

CVE-2021-27255 is a high-severity vulnerability in Netgear Br200, classified under Missing Authentication for Critical Function. CVSS score: 8.8/10. Published 2021-03-05.

How severe is CVE-2021-27255?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Netgear Br200

CVE-2021-27255

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Authentication is not required to exploit this vulnerability. The specific flaw exists within the refresh_status.aspx endpoint. The issue results from a lack of authentication required to start a service on the server. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12360.

Vulnerability class: Broken Authentication

EPSS: 0.013 (66.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

zdi-disclosures@trendmicro.com (Patch, x_refsource_MISC, Vendor Advisory)
zdi-disclosures@trendmicro.com (VDB Entry, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-27255?: CVE-2021-27255 is a high-severity vulnerability in Netgear Br200, classified under Missing Authentication for Critical Function. CVSS score: 8.8/10. Published 2021-03-05.
How severe is CVE-2021-27255?: High severity. CVSS v3 base score is 8.8 out of 10.