Submission Details
Severity:
Approve zero first
Summary
Some ERC20 tokens (like USDT) do not work when changing the allowance from an existing non-zero allowance value. For example, Tether, (USDT)
Impact
The approve() function, will revert if the current approval is not zero to protect against front-running changes of approvals.
Tools Used
Manual review
Recommendations
Consider including a requirement that the allowance is first set to zero before setting it to the new value to take all tokens into account
Updates
Lead Judging Commences
hrishibhat over 1 year ago
Submission Judgement Published Reason: Known issue
Assigned finding tags:
informational/invalid
Prize pool breakdown
Total prize
20,000 USDC
nSLOC
60933 USDC / LOC
17,500 USDC
2,500 USDC
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