Vulnerability · Published Mar 29, 2021 · Assigned by zdi
CVE-2021-27239
High 8.8
In plain English
A high-severity stack buffer overflow in Multiple Routers from NETGEAR. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| NETGEAR | Multiple Routers | firmware version 1.0.4.98 |
Weakness: CWE-121 · Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H