CORN [CornDeFi] Token

Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)

CornToken.addLiquidity(uint256,uint256) (#1346-1359) sends eth to arbitrary user
Dangerous calls:
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in CornToken._transfer(address,address,uint256) (#1260-1291):
External calls:
- swapAndLiquify() (#1270)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
- cornRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1336-1342)
External calls sending eth:
- swapAndLiquify() (#1270)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
State variables written after the call(s):
- super._transfer(sender,recipient,amount) (#1274)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#1081)
- _balances[recipient] = _balances[recipient].add(amount) (#1082)
- super._transfer(sender,BURN_ADDRESS,burnAmount) (#1286)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#1081)
- _balances[recipient] = _balances[recipient].add(amount) (#1082)
- super._transfer(sender,address(this),liquidityAmount) (#1287)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#1081)
- _balances[recipient] = _balances[recipient].add(amount) (#1082)
- super._transfer(sender,recipient,sendAmount) (#1288)
- _balances[sender] = _balances[sender].sub(amount,BEP20: transfer amount exceeds balance) (#1081)
- _balances[recipient] = _balances[recipient].add(amount) (#1082)
Apply the check-effects-interactions pattern.

Additional information: link

CornToken._writeCheckpoint(address,uint32,uint256,uint256) (#1669-1687) uses a dangerous strict equality:
- nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber (#1679)
Don't use strict equality to determine if an account has enough Ether or tokens.

Additional information: link

Combination 1: Reentrancy vulnerabilities + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

CornToken._transfer(address,address,uint256) (#1260-1291) performs a multiplication on the result of a division:
-taxAmount = amount.mul(transferTaxRate).div(10000) (#1277)
-burnAmount = taxAmount.mul(burnRate).div(100) (#1278)
Consider ordering multiplication before division.

Additional information: link

CornToken.addLiquidity(uint256,uint256) (#1346-1359) ignores return value by cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
Ensure that all the return values of the function calls are used.

Additional information: link

CornToken.swapAndLiquify().maxTransferAmount (#1296) shadows:
- CornToken.maxTransferAmount() (#1364-1366) (function)
Rename the local variables that shadow another component.

Additional information: link

Reentrancy in CornToken.swapAndLiquify() (#1294-1324):
External calls:
- swapTokensForEth(half) (#1314)
- cornRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1336-1342)
- addLiquidity(otherHalf,newBalance) (#1320)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#1320)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
State variables written after the call(s):
- addLiquidity(otherHalf,newBalance) (#1320)
- _allowances[owner][spender] = amount (#1143)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in CornToken.swapAndLiquify() (#1294-1324):
External calls:
- swapTokensForEth(half) (#1314)
- cornRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#1336-1342)
- addLiquidity(otherHalf,newBalance) (#1320)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#1320)
- cornRouter.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,operator(),block.timestamp) (#1351-1358)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#1144)
- addLiquidity(otherHalf,newBalance) (#1320)
- SwapAndLiquify(half,newBalance,otherHalf) (#1322)
Apply the check-effects-interactions pattern.

Additional information: link

CornToken.delegateBySig(address,uint256,uint256,uint8,bytes32,bytes32) (#1535-1576) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(now <= expiry,CORN::delegateBySig: signature expired) (#1574)
Avoid relying on block.timestamp.

Additional information: link

CornToken.getChainId() (#1694-1698) uses assembly
- INLINE ASM (#1696)
Do not use evm assembly.

Additional information: link

CornToken.antiWhale(address,address,uint256) (#1214-1225) compares to a boolean constant:
-require(bool,string)(swapEnabled == true,CORN::swap: Cannot transfer at the moment) (#1221)
Remove the equality to the boolean constant.

Additional information: link

SafeMath.mod(uint256,uint256,string) (#594-601) is never used and should be removed
Remove unused functions.

Additional information: link

Low level call in Address.functionDelegateCall(address,bytes,string) (#816-826):
- (success,returndata) = target.delegatecall(data) (#824)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Variable CornToken._delegates (#1477) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Redundant expression "this (#288)" inContext (#282-291)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Variable IPancakeRouter01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#80) is too similar to IPancakeRouter01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#81)
Prevent variables from having similar names.

Additional information: link

CornToken.slitherConstructorConstantVariables() (#1168-1700) uses literals with too many digits:
- BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD (#1176)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

transferOperator(address) should be declared external:
- CornToken.transferOperator(address) (#1464-1468)
Use the external attribute for functions never called from the contract.

Additional information: link

Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive. Ignore for presale.

Average PancakeSwap trading volume, liqudity, number of swaps are extremely low. Token seems to be dead.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find PancakeSwap trading pair to compute liquidity.

Unable to find PancakeSwap trading pair to compute volume.

Unable to find PancakeSwap trading pair to compute number of swaps.

Unable to find website, listings and other project-related information

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death