Vulnerability Intelligence Report
Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write
CVE-2026-121617
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.
Memory Corruption
No Active Exploit Signals
CVSS Base Score
8.7
HIGH
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Linksys | E5600 | 1.1.0.26 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Vulnerability Class
Memory Corruption
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | VulDB · Researcher · Switzerland |
| Reserved | 2026-11-03T16:39:58 |
| Published | 2026-11-04T02:45:20 |
| Last Updated | 2026-11-04T02:45:20 |
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