FKIE_CVE-2021-33403

Vulnerability from fkie_nvd - Published: 2021-08-03 22:15 - Updated: 2026-06-17 03:54
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
An integer overflow in the transfer function of a smart contract implementation for Lancer Token, an Ethereum ERC20 token, allows the owner to cause unexpected financial losses between two large accounts during a transaction.
References
cve@mitre.orghttps://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#codeExploit, Third Party Advisory
cve@mitre.orghttps://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.mdExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#codeExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.mdExploit, Third Party Advisory
Impacted products
Vendor Product Version
blocklancertoken_project blocklancertoken -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:blocklancertoken_project:blocklancertoken:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "6992DC38-3597-44DD-8A91-0EBF7CAC25EF",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An integer overflow in the transfer function of a smart contract implementation for Lancer Token, an Ethereum ERC20 token, allows the owner to cause unexpected financial losses between two large accounts during a transaction."
    },
    {
      "lang": "es",
      "value": "Un desbordamiento de enteros en la funci\u00f3n transfer de una implementaci\u00f3n de contrato inteligente para Lancer Token, un token ERC20 de Ethereum, permite al propietario causar p\u00e9rdidas financieras inesperadas entre dos grandes cuentas durante una transacci\u00f3n"
    }
  ],
  "id": "CVE-2021-33403",
  "lastModified": "2026-06-17T03:54:32.267",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-08-03T22:15:09.170",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#code"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.md"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#code"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.md"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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