CVE-2021-27256: high-severity vulnerability in NETGEAR R7800
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 1.0%
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. 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_save.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-12355.
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
NETGEAR · R7800Related CVEs — NETGEAR R7800
In the same product, most dangerous first.
CVE-2021-27255MEDIUMCVE-2021-27255EPSS 1.4%CVE-2021-27253HIGHCVE-2021-27253EPSS 1.1%CVE-2021-27252HIGHCVE-2021-27252EPSS 1.1%CVE-2021-27251HIGHCVE-2021-27251EPSS 0.7%CVE-2021-34947HIGHNETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution VulnerabilityEPSS 0.5%CVE-2021-27254MEDIUMCVE-2021-27254EPSS 0.5%