Prompt:
Rate severity of this Solidity code vulnerability:

Code:
```
contract PredictableRandom {
    function random() internal view returns (uint) {
        return uint(keccak256(abi.encodePacked(
            block.timestamp, msg.sender, block.number
        )) % 100;
    }
    function claimPrize() external {
        require(random() < 50, "not a winner");  // attacker precomputes
    }
}
```

Vulnerability: Use of Insufficiently Random Values | SWC: SWC-111 | CWE: CWE-838

Severity:

Response:
SEVERITY: HIGH

CWE: CWE-838
SWC: SWC-111

IMPACT: Predictable randomness allows attacker to always win.

<|im_start|>user
Rate severity of this Solidity code vulnerability:

Code:
```
contract PredictableRandom {
    function random() internal view returns (uint) {
        return uint(keccak256(abi.encodePacked(
            block.timestamp, msg.sender, block.number
        )) % 100;
    }
    function claimPrize() external {
        require(random() < 50, "not a winner");  // attacker precomputes
    }
}
```

Vulnerability: Use of Insufficiently Random Values | SWC: SWC-111 | CWE: CWE-838

Severity:<|im_end|>
<|im_start|>assistant
SEVERITY: HIGH

CWE: CWE-838
SWC: SWC-111

IMPACT: Predictable randomness allows attacker to always win.<|im_end|>


Prompt:
Analyze this Solidity code and assign its security severity.

Code:
```
contract SafeToken {
    mapping(address => uint256) public balanceOf;
    function transfer(address to, uint256 val) external {
        require(balanceOf[msg.sender] >= val);
        balanceOf[msg.sender] -= val;  // solidity 0.8+ checked arithmetic
        balanceOf[to] += val;
    }
}
```

SWC: N/A
CWE: N/A
Vulnerability: Safe Math Usage (NOT VULNERABLE)

Provide: (1) Severity (CRITICAL/HIGH/MEDIUM/LOW/INFO), (2) Impact summary, (3) CWE/SWC ID.

Response:
SEVERITY: INFO

CWE: N/A
SWC: N/A

IMPACT: No vulnerability. SafeMath or Solidity 0.8+ arithmetic prevents overflow.

CODE SMELL: No vulnerability - Solidity 0.8+ or SafeMath used.

<|im_start|>user
Analyze this Solidity code and assign its security severity.

Code:
```
contract SafeToken {
    mapping(address => uint256) public balanceOf;
    function transfer(address to, uint256 val) external {
        require(balanceOf[msg.sender] >= val);
        balanceOf[msg.sender] -= val;  // solidity 0.8+ checked arithmetic
        balanceOf[to] += val;
    }
}
```

SWC: N/A
CWE: N/A
Vulnerability: Safe Math Usage (NOT VULNERABLE)

Provide: (1) Severity (CRITICAL/HIGH/MEDIUM/LOW/INFO), (2) Impact summary, (3) CWE/SWC ID.<|im_end|>
<|im_start|>assistant
SEVERITY: INFO

CWE: N/A
SWC: N/A

IMPACT: No vulnerability. SafeMath or Solidity 0.8+ arithmetic prevents overflow.

CODE SMELL: No vulnerability - Solidity 0.8+ or SafeMath used.<|im_end|>