Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-4861",
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "dateUpdated": "2026-03-26T18:28:13.605Z",
    "dateReserved": "2026-03-25T16:31:03.203Z",
    "datePublished": "2026-03-26T08:18:07.028Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB",
        "dateUpdated": "2026-03-26T08:18:07.028Z"
      },
      "title": "Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow",
      "descriptions": [
        {
          "lang": "en",
          "value": "A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way."
        }
      ],
      "affected": [
        {
          "vendor": "Wavlink",
          "product": "WL-NU516U1",
          "cpes": [
            "cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*"
          ],
          "versions": [
            {
              "version": "260227",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Stack-based Buffer Overflow",
              "cweId": "CWE-121",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Memory Corruption",
              "cweId": "CWE-119",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://vuldb.com/?id.353192",
          "name": "VDB-353192 | Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow",
          "tags": [
            "vdb-entry",
            "technical-description"
          ]
        },
        {
          "url": "https://vuldb.com/?ctiid.353192",
          "name": "VDB-353192 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ]
        },
        {
          "url": "https://vuldb.com/?submit.776217",
          "name": "Submit #776217 | Wavlink NU516U1  V260227 Stack-based Buffer Overflow",
          "tags": [
            "third-party-advisory"
          ]
        },
        {
          "url": "https://github.com/Wlz1112/WAVLINK-NU516U1-V260227/blob/main/Content-Length.md",
          "tags": [
            "exploit"
          ]
        }
      ],
      "metrics": [
        {},
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R",
            "baseScore": 8.8,
            "baseSeverity": "HIGH"
          }
        },
        {
          "cvssV3_0": {
            "version": "3.0",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R",
            "baseScore": 8.8,
            "baseSeverity": "HIGH"
          }
        },
        {
          "cvssV2_0": {
            "version": "2.0",
            "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR",
            "baseScore": 9
          }
        }
      ],
      "timeline": [
        {
          "time": "2026-03-25T00:00:00.000Z",
          "lang": "en",
          "value": "Advisory disclosed"
        },
        {
          "time": "2026-03-25T01:00:00.000Z",
          "lang": "en",
          "value": "VulDB entry created"
        },
        {
          "time": "2026-03-25T17:36:08.000Z",
          "lang": "en",
          "value": "VulDB entry last update"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "haimianbaobao (VulDB User)",
          "type": "reporter"
        },
        {
          "lang": "en",
          "value": "VulDB",
          "type": "coordinator"
        }
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-03-26T18:28:13.605Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
          {}
        ]
      }
    ]
  }
}