What is the severity of ZDI-21-1274?

The severity of ZDI-21-1274 is classified as critical due to its ability to allow arbitrary code execution without authentication.

How do I fix ZDI-21-1274?

To fix ZDI-21-1274, you should update your NETGEAR router firmware to the latest version provided by NETGEAR.

Which NETGEAR routers are affected by ZDI-21-1274?

ZDI-21-1274 affects multiple NETGEAR routers that utilize the httpd service exposed on TCP port 80.

Can ZDI-21-1274 be exploited remotely?

Yes, ZDI-21-1274 can be exploited remotely by network-adjacent attackers without the need for any authentication.

What type of vulnerability is ZDI-21-1274?

ZDI-21-1274 is a pre-authentication buffer overflow vulnerability that allows arbitrary code execution.

Vulnerability/
ZDI-21-1274

high

8.8

23/2/2025

ZDI-21-1274: NETGEAR Multiple Routers httpd Stack-based Buffer Overflow Remote Code Execution Vulnerability

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. When parsing the strings file, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.

Affected Software	Affected Version	How to fix
NETGEAR Multiple Devices

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Frequently Asked Questions

What is the severity of ZDI-21-1274?
The severity of ZDI-21-1274 is classified as critical due to its ability to allow arbitrary code execution without authentication.
How do I fix ZDI-21-1274?
To fix ZDI-21-1274, you should update your NETGEAR router firmware to the latest version provided by NETGEAR.
Which NETGEAR routers are affected by ZDI-21-1274?
ZDI-21-1274 affects multiple NETGEAR routers that utilize the httpd service exposed on TCP port 80.
Can ZDI-21-1274 be exploited remotely?
Yes, ZDI-21-1274 can be exploited remotely by network-adjacent attackers without the need for any authentication.
What type of vulnerability is ZDI-21-1274?
ZDI-21-1274 is a pre-authentication buffer overflow vulnerability that allows arbitrary code execution.

agent/severity
agent/title
agent/references
agent/softwarecombine
agent/type
agent/description
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-21-1274
alias/ZDI-CAN-13709
alias/CVE-2021-34982
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/netgear
canonical/netgear multiple devices

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