Blockchain networks are not immune to security threats. In this article I will identifies common security threats and vulnerabilities that blockchain systems may encounter. We'll examine the notorious double-spending attack and delve into concepts like Sybil attacks and the infamous 51% attack. You'll also explore vulnerabilities associated with smart contracts and their potential consequences. Below are the 6 common threat and vulnerabilities and 5 ways to mitigate these risks.

51% Attack: An attacker gains control of more than 50% of the computing power on a blockchain network, allowing them to reverse transactions and double-spend coins.
Sybil Attack: An attacker creates multiple fake identities on a blockchain network in order to gain more influence or control.
Denial-of-Service Attack: An attacker floods a blockchain network with traffic, making it difficult or impossible for legitimate users to access it.
Phishing Attack: An attacker attempts to trick users into revealing their private keys or other sensitive information.
Smart Contract Vulnerability: A flaw in a smart contract code that can be exploited by an attacker to steal funds or otherwise disrupt the operation of the contract.
Social Engineering Attack: An attacker manipulates users into performing actions that compromise their security, such as sending funds to a malicious address.

How to mitigate these risks:

Use a reputable wallet service to store your crypto currency.
Be careful about what links you click on and what attachments you open.
Keep your software up to date.
Be careful about who you share your private keys with.
Do your research before investing in any Cryptocurrencies project.

It is also important to note that blockchain technology is still under development, and new security threats and vulnerabilities may emerge in the future. It is important to stay informed about the latest security news and to take steps to protect your assets.