What is CVE-2021-27253?

CVE-2021-27253 is a high-severity vulnerability in Netgear Br200, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2021-04-14.

How severe is CVE-2021-27253?

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

Buffer overflow in Netgear Br200

CVE-2021-27253

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_bind.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12303.

Vulnerability class: Buffer Overflow

EPSS: 0.011 (63.0th 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)

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-2021-27253?: CVE-2021-27253 is a high-severity vulnerability in Netgear Br200, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2021-04-14.
How severe is CVE-2021-27253?: High severity. CVSS v3 base score is 8.8 out of 10.