CVE-2026-121616 (GCVE-0-2026-121616)

Vulnerability from cvelistv5 – Published: 2026-11-04 02:30 – Updated: 2026-11-04 02:30 Unsupported When Assigned
VLAI
Title
Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write
Summary
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.
Severity
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
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
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
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3811 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linksys E5600 Affected: 1.1.0.26
    cpe:2.3:o:linksys:e5600_firmware:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
liuyingqi (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:o:linksys:e5600_firmware:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "JSON Request Parser"
          ],
          "product": "E5600",
          "vendor": "Linksys",
          "versions": [
            {
              "status": "affected",
              "version": "1.1.0.26"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "liuyingqi (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
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          "value": "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."
        }
      ],
      "metrics": [
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            "baseSeverity": "MEDIUM",
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        },
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          "name": "CVE-2026-121616 | CVE Analysis and Report",
          "tags": [
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          "url": "https://vuldb.com/cve/CVE-2026-121616"
        },
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        },
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          "url": "https://github.com/Zimo-666/E5600-cves/tree/main/03-mesh-login-global-overflow"
        },
        {
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          "url": "https://www.linksys.com/"
        }
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      "tags": [
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          "time": "2026-11-03T17:45:13.000Z",
          "value": "VulDB entry last update"
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      "title": "Linksys E5600 JSON Request mesh_login.cgi strcpy out-of-bounds write",
      "x_generator": [
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      ]
    }
  },
  "cveMetadata": {
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    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-121616",
    "datePublished": "2026-11-04T02:30:21.965Z",
    "dateReserved": "2026-11-03T16:39:55.066Z",
    "dateUpdated": "2026-11-04T02:30:21.965Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-11-04",
      "epss": "0.00301",
      "percentile": "0.23003"
    },
    "nvd": {
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                ],
                "modules": [
                  "JSON Request Parser"
                ],
                "product": "E5600",
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            "tags": [
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        ],
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          }
        ],
        "id": "CVE-2026-121616",
        "lastModified": "2026-11-04T03:17:15.233",
        "metrics": {
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                "authentication": "NONE",
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          "cvssMetricV40": [
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                "Recovery": "NOT_DEFINED",
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                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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                "privilegesRequired": "NONE",
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    }
  }
}



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