CVE-2021-27255: (Pwn2Own) NETGEAR R7800 funjsq_httpd Missing Authentication for Critical Function Remote Code Execution Vulnerability
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 refreshstatus.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.
Other sources
This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the refreshstatus.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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2021-27255?
CVE-2021-27255 has a critical severity rating due to the possibility of remote code execution without authentication.
How do I fix CVE-2021-27255?
To fix CVE-2021-27255, upgrade your NETGEAR R7800 firmware to version 1.0.2.80 or later.
Which NETGEAR devices are affected by CVE-2021-27255?
CVE-2021-27255 primarily affects NETGEAR R7800 firmware version 1.0.2.76 and earlier.
Can CVE-2021-27255 be exploited without user authentication?
Yes, CVE-2021-27255 can be exploited by attackers remotely without requiring any user authentication.
Is there any workaround for CVE-2021-27255 if I cannot update immediately?
Currently, there are no reliable workarounds for CVE-2021-27255 other than updating the firmware to a secure version.