Live › vulnerability › CVE-2026-121617
The Linksys E5600 router's firmware upload CGI handler (/cgi-bin/upload_fw.cgi) has an out-of-bounds write in its multipart header parsing. A remote attacker can send a crafted request to corrupt memory on the device, and a public exploit exists.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-11-04 03:46 UTC. All times on this page are UTC.
Owners of Linksys E5600 routers running firmware 1.1.0.26, where the upload_fw.cgi handler is reachable over the network. The sources say the product is no longer supported by the maintainer and the vendor did not respond, so no fix is expected. Devices not running this model or firmware are not affected.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| E5600 | vendor | 1.1.0.26 | – |
1.1.0.26.No fix yet, per the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
A security flaw has been discovered in Linksys E5600 1.1.0.26. Affected by this issue is the function init_multipart of the file /cgi-bin/upload_fw.cgi of the component Header Parser. The manipulation results in out-of-bounds write. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
This page as .md · .json · in your agent: get_signal("CVE-2026-121617")
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