CVE-2026-121617
Linksys E5600 Header upload_fw.cgi init_multipart out-of-bounds write
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 CWE-119 |
| Vendor | linksys |
| Product | e5600 |
| Published | Nov 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linksys / E5600
1.1.0.26
References
vuldb.com: https://vuldb.com/vuln/430465 vuldb.com: https://vuldb.com/vuln/430465/cti vuldb.com: https://vuldb.com/cve/CVE-2026-121617 vuldb.com: https://vuldb.com/submit/1023313 github.com: https://github.com/Zimo-666/E5600-cves/tree/main/04-upload-fw-multipart-overflow linksys.com: https://www.linksys.com/
Credits
🔍 liuyingqi (VulDB User) VulDB CNA Team