CVE-2021-33403

Name: CVE-2021-33403
Creator: NVD / NIST
Published: 2021-08-03T22:15:09.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2021-33403 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.20%

64.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Blocklancertoken Project	Blocklancertoken	All versions

References

https://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#codeExploit, Third Party Advisory
https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.mdExploit, Third Party Advisory
https://cn.etherscan.com/address/0x63e634330a20150dbb61b15648bc73855d6ccf07#codeExploit, Third Party Advisory
https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/LNCToken.mdExploit, Third Party Advisory

Timeline

Published: Aug 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33403?

How severe is CVE-2021-33403?

CVE-2021-33403 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33403?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33403?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST