CVE-2026-121616 Details
Description
A vulnerability was identified in Linksys E5600 1.1.0.26. Affected by this vulnerability is the function strcpy of the file /cgi-bin/mesh_login.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.
A vulnerability allowing out-of-bounds write has been identified in the Linksys E5600 router, specifically in the JSON request parser of the 'mesh_login.cgi' file. This issue arises from the 'strcpy' function, which copies user-controlled data from the 'username', 'password', 'token', 'source', 'cn', and 'action' fields into fixed-size global buffers without proper length checks. The vulnerability can be exploited remotely, leading to memory corruption of global state variables that are relevant to security, particularly those associated with the login process. This flaw only affects devices that are no longer supported by the vendor.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 4, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Zimo-666/E5600-cves/tree/main/03-mesh-login-global-overflow | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121616 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1023312 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/430464 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/430464/cti | [email protected] | Content Wall |
| https://www.linksys.com/ | [email protected] | Vendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Linksys E5600 | 1.1.0.26 |
CPE
Remediation
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 4, 2026 | New CVE Received | [email protected] |