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/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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| E5600 Linksys |
1.1.0.26 (affected) | CNA: VulDB |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P | CNA: VulDB |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C | CNA: VulDB |
| 3.0 / 5.3 medium |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C | CNA: VulDB |
| 2.0 / 5.0 medium |
AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:C | CNA: VulDB |
Exploit evidence
- https://github.com/Zimo-666/E5600-cves/tree/main/03-mesh-login-global-overflow
exploit · CNA: VulDB
References
- https://vuldb.com/vuln/430464CNA: VulDB · vdb-entry, technical-description
- https://vuldb.com/vuln/430464/ctiCNA: VulDB · signature, permissions-required
- https://vuldb.com/cve/CVE-2026-121616CNA: VulDB · third-party-advisory
- https://vuldb.com/submit/1023312CNA: VulDB · third-party-advisory
- https://github.com/Zimo-666/E5600-cves/tree/main/03-mesh-login-global-overflowCNA: VulDB · exploit
- https://www.linksys.com/CNA: VulDB · product
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