Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linksys | E5600 | 1.1.0.26 | — |
Advisories 1
- WID-SEC-2026-4327 Linksys Router E5600: Mehrere Schwachstellen ermöglichen Privilegieneskalation BSI CERT-Bund (WID) · Nov 3, 2026
References
- VDB-430465 | Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write vdb-entry technical-description
- VDB-430465 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-121617 | CVE Analysis and Report third-party-advisory
- Submit #1023313 | Linksys E5600 1.1.0.26 Buffer Overflow - Out-of-bounds Write (CWE-787) third-party-advisory
- https://github.com/Zimo-666/E5600-cves/tree/main/04-upload-fw-multipart-overflow exploit
- https://www.linksys.com/ product