Vulnerabilities > CVE-2020-24837 - Integer Underflow (Wrap or Wraparound) vulnerability in Zcfees Project Zcfees
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
PARTIAL Availability impact
NONE Summary
An integer underflow has been found in the latest version of ZCFees. The variables 'currPeriodIdx' and 'lastPeriodExecIdx' are both unsigned integers, and the result of the minus operation may be a negative integer which leads to an underflow. The attackers can modify the current timestamp of the transaction somehow and block the execution of the process function.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 1 |