CGC [Chinese Grimace Coin] Token

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

ChineseGrimaceCoin.addLiquidity(uint256,uint256) (#713-726) sends eth to arbitrary user
Dangerous calls:
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in ChineseGrimaceCoin._transfer(address,address,uint256) (#565-654):
External calls:
- handle_fees(feeswap,currentTaxes) (#642)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- address(marketingWallet).sendValue(marketingAmt) (#684)
- address(devWallet).sendValue(devAmt) (#689)
External calls sending eth:
- handle_fees(feeswap,currentTaxes) (#642)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
State variables written after the call(s):
- super._transfer(sender,recipient,amount - fee) (#645)
- _balances[sender] = senderBalance - amount (#275)
- _balances[recipient] += amount (#276)
- super._transfer(sender,address(this),feeAmount) (#650)
- _balances[sender] = senderBalance - amount (#275)
- _balances[recipient] += amount (#276)
Apply the check-effects-interactions pattern.

Additional information: link

ChineseGrimaceCoin.rescueBEP20(address,uint256) (#819-821) ignores return value by IERC20(tokenAdd).transfer(devWallet,amount) (#820)
Use SafeERC20, or ensure that the transfer/transferFrom return value is checked.

Additional information: link

Too many vulnerabilities (Unchecked transfer, Reentrancy vulnerability, etc.). High risk of a scam. DYOR & manual audit are advised.

ChineseGrimaceCoin._transfer(address,address,uint256).fee (#607) is written in both
fee = 0 (#616)
fee = (amount * feesum) / 100 (#638)
Fix or remove the writes.

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.

Combination 2: Unchecked transfer + 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.

Combination 3: Reentrancy vulnerabilities + Unchecked transfer vulnerability. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693) performs a multiplication on the result of a division:
-unitBalance = deltaBalance / (denominator - swapTaxes.liquidity) (#674)
-bnbToAddLiquidityWith = unitBalance * swapTaxes.liquidity (#675)
ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693) performs a multiplication on the result of a division:
-unitBalance = deltaBalance / (denominator - swapTaxes.liquidity) (#674)
-marketingAmt = unitBalance * 2 * swapTaxes.marketing (#682)
ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693) performs a multiplication on the result of a division:
-unitBalance = deltaBalance / (denominator - swapTaxes.liquidity) (#674)
-devAmt = unitBalance * 2 * swapTaxes.dev (#687)
Consider ordering multiplication before division.

Additional information: link

ChineseGrimaceCoin._transfer(address,address,uint256).feeswap (#605) is a local variable never initialized
ChineseGrimaceCoin._transfer(address,address,uint256).currentTaxes (#608) is a local variable never initialized
ChineseGrimaceCoin._transfer(address,address,uint256).feesum (#606) is a local variable never initialized
Initialize all the variables. If a variable is meant to be initialized to zero, explicitly set it to zero to improve code readability.

Additional information: link

ChineseGrimaceCoin.addLiquidity(uint256,uint256) (#713-726) ignores return value by router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
Ensure that all the return values of the function calls are used.

Additional information: link

ChineseGrimaceCoin.updateLiquidityTreshhold(uint256) (#733-736) should emit an event for:
- tokenLiquidityThreshold = new_amount * 10 ** decimals() (#735)
ChineseGrimaceCoin.updateTradingEnabled(bool,uint256,uint256) (#751-761) should emit an event for:
- deadline = _deadline (#756)
- launchtax = _launchtax (#757)
ChineseGrimaceCoin.updateCooldown(bool,uint256) (#771-774) should emit an event for:
- coolDownTime = time * 1 (#772)
ChineseGrimaceCoin.updateMaxTxLimit(uint256,uint256) (#806-809) should emit an event for:
- maxBuyLimit = maxBuy * 10 ** decimals() (#807)
- maxSellLimit = maxSell * 10 ** decimals() (#808)
ChineseGrimaceCoin.updateMaxWalletlimit(uint256) (#811-813) should emit an event for:
- maxWalletLimit = amount * 10 ** decimals() (#812)
Emit an event for critical parameter changes.

Additional information: link

ChineseGrimaceCoin.constructor(address)._pair (#502) lacks a zero-check on :
- pair = _pair (#505)
ChineseGrimaceCoin.updateRouterAndPair(address,address).newPair (#746) lacks a zero-check on :
- pair = newPair (#748)
ChineseGrimaceCoin.updateMarketingWallet(address).newWallet (#763) lacks a zero-check on :
- marketingWallet = newWallet (#764)
ChineseGrimaceCoin.updateDevWallet(address).newWallet (#767) lacks a zero-check on :
- devWallet = newWallet (#768)
Check that the address is not zero.

Additional information: link

Modifier ChineseGrimaceCoin.mutexLock() (#488-494) does not always execute _; or revert
All the paths in a modifier must execute _ or revert.

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Reentrancy in ChineseGrimaceCoin.constructor(address) (#496-518):
External calls:
- _pair = IFactory(_router.factory()).createPair(address(this),_router.WETH()) (#502)
State variables written after the call(s):
- allowedTransfer[address(this)] = true (#511)
- allowedTransfer[owner()] = true (#512)
- allowedTransfer[pair] = true (#513)
- allowedTransfer[marketingWallet] = true (#514)
- allowedTransfer[devWallet] = true (#515)
- allowedTransfer[deadWallet] = true (#516)
- exemptFee[address(this)] = true (#506)
- exemptFee[marketingWallet] = true (#507)
- exemptFee[devWallet] = true (#508)
- exemptFee[deadWallet] = true (#509)
- pair = _pair (#505)
- router = _router (#504)
Reentrancy in ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693):
External calls:
- swapTokensForBNB(toSwap) (#671)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
External calls sending eth:
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
State variables written after the call(s):
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
- _allowances[owner][spender] = amount (#345)
Reentrancy in ChineseGrimaceCoin.transferFrom(address,address,uint256) (#525-537):
External calls:
- _transfer(sender,recipient,amount) (#530)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- address(marketingWallet).sendValue(marketingAmt) (#684)
- address(devWallet).sendValue(devAmt) (#689)
External calls sending eth:
- _transfer(sender,recipient,amount) (#530)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
State variables written after the call(s):
- _approve(sender,_msgSender(),currentAllowance - amount) (#534)
- _allowances[owner][spender] = amount (#345)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in ChineseGrimaceCoin._transfer(address,address,uint256) (#565-654):
External calls:
- handle_fees(feeswap,currentTaxes) (#642)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- address(marketingWallet).sendValue(marketingAmt) (#684)
- address(devWallet).sendValue(devAmt) (#689)
External calls sending eth:
- handle_fees(feeswap,currentTaxes) (#642)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
Event emitted after the call(s):
- Transfer(sender,recipient,amount) (#278)
- super._transfer(sender,recipient,amount - fee) (#645)
- Transfer(sender,recipient,amount) (#278)
- super._transfer(sender,address(this),feeAmount) (#650)
Reentrancy in ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693):
External calls:
- swapTokensForBNB(toSwap) (#671)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
External calls sending eth:
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#346)
- addLiquidity(tokensToAddLiquidityWith,bnbToAddLiquidityWith) (#679)
Reentrancy in ChineseGrimaceCoin.transferFrom(address,address,uint256) (#525-537):
External calls:
- _transfer(sender,recipient,amount) (#530)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
- router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#704-710)
- address(marketingWallet).sendValue(marketingAmt) (#684)
- address(devWallet).sendValue(devAmt) (#689)
External calls sending eth:
- _transfer(sender,recipient,amount) (#530)
- router.addLiquidityETH{value: bnbAmount}(address(this),tokenAmount,0,0,owner(),block.timestamp) (#718-725)
- (success) = recipient.call{value: amount}() (#374)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#346)
- _approve(sender,_msgSender(),currentAllowance - amount) (#534)
Apply the check-effects-interactions pattern.

Additional information: link

ChineseGrimaceCoin._transfer(address,address,uint256) (#565-654) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(timePassed >= coolDownTime,Cooldown enabled) (#600)
Avoid relying on block.timestamp.

Additional information: link

ChineseGrimaceCoin.updateTradingEnabled(bool,uint256,uint256) (#751-761) compares to a boolean constant:
-state == true (#760)
Remove the equality to the boolean constant.

Additional information: link

Context._msgData() (#17-20) is never used and should be removed
ERC20._burn(address,uint256) (#311-322) is never used and should be removed
Remove unused functions.

Additional information: link

Low level call in Address.sendValue(address,uint256) (#371-376):
- (success) = recipient.call{value: amount}() (#374)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Variable ERC20._balances (#63) is not in mixedCase
Variable ERC20._allowances (#65) is not in mixedCase
Function IRouter.WETH() (#420) is not in mixedCase
Function ChineseGrimaceCoin.handle_fees(uint256,ChineseGrimaceCoin.Taxes) (#656-693) is not in mixedCase
Parameter ChineseGrimaceCoin.updateLiquidityTreshhold(uint256).new_amount (#733) is not in mixedCase
Parameter ChineseGrimaceCoin.updateTradingEnabled(bool,uint256,uint256)._deadline (#753) is not in mixedCase
Parameter ChineseGrimaceCoin.updateTradingEnabled(bool,uint256,uint256)._launchtax (#754) is not in mixedCase
Parameter ChineseGrimaceCoin.updateExemptFee(address,bool)._address (#796) is not in mixedCase
Variable ChineseGrimaceCoin.genesis_block (#462) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Redundant expression "this (#18)" inContext (#12-21)
Remove redundant statements if they congest code but offer no value.

Additional information: link

ChineseGrimaceCoin.slitherConstructorVariables() (#447-826) uses literals with too many digits:
- deadWallet = 0x000000000000000000000000000000000000dEaD (#466)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

ChineseGrimaceCoin.deadWallet (#466) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

name() should be declared external:
- ERC20.name() (#89-91)
symbol() should be declared external:
- ERC20.symbol() (#97-99)
totalSupply() should be declared external:
- ERC20.totalSupply() (#121-123)
transfer(address,uint256) should be declared external:
- ChineseGrimaceCoin.transfer(address,uint256) (#560-563)
- ERC20.transfer(address,uint256) (#140-148)
allowance(address,address) should be declared external:
- ERC20.allowance(address,address) (#153-161)
approve(address,uint256) should be declared external:
- ChineseGrimaceCoin.approve(address,uint256) (#520-523)
- ERC20.approve(address,uint256) (#170-173)
transferFrom(address,address,uint256) should be declared external:
- ChineseGrimaceCoin.transferFrom(address,address,uint256) (#525-537)
- ERC20.transferFrom(address,address,uint256) (#188-200)
increaseAllowance(address,uint256) should be declared external:
- ChineseGrimaceCoin.increaseAllowance(address,uint256) (#539-546)
- ERC20.increaseAllowance(address,uint256) (#214-221)
decreaseAllowance(address,uint256) should be declared external:
- ChineseGrimaceCoin.decreaseAllowance(address,uint256) (#548-558)
- ERC20.decreaseAllowance(address,uint256) (#237-247)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#397-399)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#401-404)
Use the external attribute for functions never called from the contract.

Additional information: link

Token seems to be untradeable: there is no PancakeSwap trading pair and no trading volumes. Ignore for presale.

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

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

Young tokens have high risks of scam / price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank