CVE-2021-27239: netgear d6220_firmware Stack-based Buffer Overflow

Vulnerability summary

CVE-2021-27239 is a high (CVSS 8.8) Stack-based Buffer Overflow vulnerability in netgear d6220_firmware. EPSS estimates a 0.77% chance of exploitation in the next 30 days, higher than 54.6% of scored vulnerabilities.

Timeline

1. 29-03-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).