High severity8.8NVD Advisory· Published Mar 5, 2021· Updated Jun 17, 2026
CVE-2021-27256
CVE-2021-27256
Description
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.
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Affected products
46cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*range: <1.0.2.80
- (no CPE)range: 1.0.2.76
Patches
Vulnerability mechanics
References
2- kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-ExtendersnvdPatchVendor Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-262/nvdThird Party AdvisoryVDB Entry
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