CVE-2026-121616: Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write
A vulnerability was identified in Linksys E5600 1.1.0.26. Affected by this vulnerability is the function strcpy of the file /cgi-bin/meshlogin.cgi of the component JSON Request Parser. The manipulation of the argument username/password/token/source/cn/action leads to out-of-bounds write. The attack may be initiated remotely. The exploit is publicly available and might be used. 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.
Event History
Frequently Asked Questions
Which deployments are exposed?
Linksys E5600 devices running version 1.1.0.26 are identified as affected. The issue is reachable remotely through the JSON Request Parser in /cgi-bin/mesh_login.cgi.
Does exploitation require authentication or user interaction?
No authentication or user interaction is indicated. An attacker can remotely manipulate the username, password, token, source, cn, or action argument to trigger the out-of-bounds write.
Is public exploit code available?
Yes. The vulnerability is flagged as having a proof of concept, and the available information states that a public exploit exists and might be used.
What are the patching prospects?
The affected products are no longer supported by the maintainer. The vendor was contacted but did not respond, so a vendor fix is not indicated by the available information.