Blockchain Security Issues and Vulnerabilities

5 Common Blockchain Security Issues and Vulnerabilities

Although Blockchain is inherently protected, it has some security-related downsides. Digital ledgers are helpful for businesses, so they have grown in popularity over several years as the crypto-markets have moved toward center stage. Rather than crypto assets, there are several ledger use cases, such as blockchain gaming. However, along with its rapid use, many ledger security vulnerabilities have simultaneously emerged due to bad tools and technology applications. So, let’s explore some of the top blockchain security threats in 2022. 

5 Common Blockchain Security Vulnerabilities 

Blockchain undeniably benefits companies but has important drawbacks due to certain security issues. Here is the list of the top blockchain security issues and their solutions. Yet, if you conduct your research correctly, you may always be prepared for challenges. So, what are these problems?

#1 Phishing Attacks

Phishing attacks on private and public blockchain networks are growing, thus causing weighty issues. It occurs when a hacker steals a user’s credentials. Then, fraudsters send legitimate-looking emails to the wallet key owner, requesting to send their credentials using fake hyperlinks. Access privileges to a user’s sensitive data and login details may result in losses for the blockchain network. The targets of phishing attacks are frequently individuals or business employees.

To prevent Phishing attempts:

  • Check if your system and software are state-of-the-art.
  • Install software for malicious link detection and dependable antivirus software.
  • Improve browser security; install a verified add-on to inform you about risky websites.
  • If you get an email requesting login details, reconfirm with the partner about the issue.
  • Avoid free Wi-Fi networks when opening an e-wallet or other significant banking transactions.
  • Don’t click on the suspicious link until carefully reviewing it. Instead of clicking, enter that address into your browser. 

#2 Routing Attacks

Transactions are recorded on digital ledgers in real time. Attackers can tamper with massive confidential data as it moves from the user to internet service providers. They can access sensitive data or funds in the transmission process to internet providers. As blockchain participants are unaware of the danger, data transmission and operations proceed as usual.

The risk is that such attacks will often expose private data or extract crypto without the user’s knowledge.

To prevent Blockchain security issues named routing attacks:

  • Use data encryption.
  • Educate your staff about data security-related risks.
  • Apply secure routing protocols (with certificates).
  • Use strong passwords and change them regularly.

#3 Endpoint Vulnerabilities on Blockchain

The weaknesses of blockchain endpoints are another major security concern in ledger security. The network’s endpoint is the hub where participants interact with the ledger: on smart devices. Fraudsters observe user behavior with target devices to snip the user’s key. This blockchain security issue is one of the most noticeable ones.

To prevent blockchain endpoint vulnerabilities:

  • Regularly review the system, and keep track of the location, time, and device access.
  • Download and install an antivirus software package for your smart devices.
  • Do not save blockchain keys on your PC or smartphone as text files.
  • Conduct more frequent Blockchain security audits.

#4 Sybil Attacks

The term “Sybil” is coined from a memorable book character suffering from a multiple personality disorder. In a Sybil attack, Hackers may generate numerous fake network nodes to utilize many fake network identities. Thus, the attacker can obtain a majority consensus and disrupt the network’s transactions. Consequently, a Sybil assault occurs.

To prevent Sybil attacks on blockchain infrastructure:

  • Monitor the behavior of nodes and scan for the node-only forwarding blocks from one participant.
  • Use proper consensus algorithms.

While the mentioned algorithms may not fully prevent these attacks, they may place the sensitive information in safe locations, thus making data loss impossible. 

#5 51% Attacks

Mining requires significant computing power, especially in validating transactions in large-scale public blockchains. Yet, if malicious hackers gather sufficient resources, they will seize over 50% of the Blockchain’s mining power, obtaining control over the chain. For example, cyberattackers can modify the order of financial operations or reverse blockchain transactions, resulting in double spending.

  • %51 attacks are probably the biggest threat to the entire digital ecosystem.
  • 51% of attacks do not occur on private blockchain networks.

So, to prepare against these 51% attacks:

  • Avoid implementing PoW consensus procedures.
  • Make sure that the hash rate is higher.
  • Develop mining pool observation.

Blockchain Security Best Practices

While developing a blockchain solution, think through the essential questions listed below:

  • What data is going to be included in each block?
  • How are individuals’ specifics handled? Are block payloads encrypted?
  • What is the governance structure for partaking companies or members?
  • What are the related regulatory standards? How can they be met?
  • What is the logic behind resolving ledger block conflicts?
  • What is the survival plan in the case of a breach?
  • What is the bare minimum security posture for chain users?

When generating a private blockchain, ensure it’s built on a protected and stable basis. Poor technological options for business requirements and processes can expose information security vulnerabilities.

Pay attention to both governance and business risks. Financial, regulatory issues, and reputation concerns are some examples. Moreover, the decentralized nature of blockchain solutions’ raises governance risks, which need tight control over access management.

Blockchain security is all about managing blockchain network threats. Develop a blockchain security model to ensure your blockchain solutions are adequately protected.

Developers should assess the threats and build a risk model to address all kinds of risks to the ledger solution. Next, they should outline security measures to lessen risks in these categories:

  • Use traditional security methods
  • Check that unique security controls are in place.
  • Implement corporate policies on the ledger.

Remember that blockchain technologies are, in fact, as secure as their underlying code. Hence, run in-depth tests for any potential blockchain security risks. 

What Can Go Wrong with Blockchain Network?

Since, by design, the ledger is decentralized, it is a perfect technology for cybersecurity. Blockchain technology has applications like anti-money laundering monitoring, medical and financial transactions, and data sharing. Yet, in practice,

  • When using the Blockchain, users’ mistakes make the network vulnerable.
  • The digital ledger may already have been hacked.
  • You have yet to observe a blockchain-based far-reaching application, which may destroy it.
  • The security of ledger applications and technologies depends on their inherent weaknesses.
  • Blockchain apps are also susceptible to typical program flaws: coding errors and weaknesses allow attackers to gain a stable position.
  • Fraudsters always look for ways to compromise the security of the Blockchain somehow.

The ledger is only as secure as its computing power. Hackers will gain an advantage as more powerful mainframes, and sophisticated algorithms start to dominate the marketplace. 


While blockchain networks may have several blockchain-security vulnerabilities and errors, cybersecurity professionals can find effective solutions to mitigate these issues. IT specialists with properly honed technical and analytical abilities will be well-positioned to use Blockchain most securely. Besides, regular detailed security audits and Pentesting will prevent your ledger from becoming useless in the future.


What is the biggest blockchain-based issue?

Transaction Speed. In many applications, networks have sluggish transaction speed problems. Moreover, each transaction requires verification by the corresponding node.

Do blockchains have security issues?

Decentralized distributed ledger technology keeps all operations data. Security transactions rely on decentralization and cryptographic technology. Despite the lack of Blockchain technology infrastructure, dozens of issues arise.

Is Blockchain highly secure?

Blockchain technology converts to an information structure that delivers security characteristics. Via the smart contract principle, a cryptographic network is supported by decentralization and is designed for security.

What are the threats to the Blockchain?

The major threats to cyber-attacks are authorization, security, scalability issues, and high power and energy consumption.