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CVE Record

CVE-2021-33403: An integer overflow in the transfer function of a smart contract implementation for Lancer Token, an Ethere...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-33403 describes an integer overflow in the transfer logic of the Lancer Token ERC20 smart contract. The reported impact is unexpected financial loss between two large accounts during a transaction, triggered by the owner. The public record does not provide CVSS, affected versions, a vendor patch, or evidence of exploitation.

Executive priority

Prioritize if the organization holds, lists, custodies, or integrates with Lancer Token. Otherwise, this is likely a narrow smart-contract exposure rather than a broad enterprise software emergency. The main business concern is financial loss from token mechanics with unclear remediation status.

Technical view

The CVE attributes the flaw to arithmetic overflow in the token transfer function. Because the affected component is a deployed Ethereum ERC20 contract, exposure depends on whether an organization holds, accepts, audits, or integrates with that specific Lancer Token contract. Sources do not identify CWE, code-level root cause details, or a corrected contract version.

Likely exposure

Exposure appears limited to parties interacting with the referenced Lancer Token ERC20 contract, especially holders, counterparties, wallets, exchanges, or DeFi integrations that process transfers involving large balances. The CVE record lists affected vendor, product, versions, and CPEs as n/a, so asset matching requires contract-level review.

Exploitation context

The bundle does not cite active exploitation, and KEV status is false. The described abuse condition involves the contract owner causing unexpected losses between two large accounts during a transaction. Public sources provided here are insufficient to confirm real-world incidents, exploit availability, or whether the issue was remediated.

Researcher notes

Evidence is thin: no CVSS, CWE, affected version range, exploit status, or fix is documented in the provided bundle. Analysis should center on the referenced contract code and LNCToken write-up, while avoiding assumptions about other ERC20 tokens or unrelated smart contracts.

Mitigation direction

  • Check official token or contract maintainer guidance for any migration or remediation notice.
  • Identify holdings, integrations, custodial accounts, or listings tied to the referenced Lancer Token contract.
  • Reduce or suspend business exposure if material balances depend on the vulnerable contract.
  • Review smart contract risk acceptance for tokens without clear vendor ownership or patch information.

Validation and detection

  • Match internal records against the referenced Etherscan contract address.
  • Confirm whether wallets, exchanges, or DeFi systems process Lancer Token transfers.
  • Review transaction history for large-account transfers involving the token owner.
  • Verify whether any replacement contract or migration notice exists from authoritative maintainers.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-33403 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.