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BNB Smart Chain Hit by Copycat Vyper Attack, $73K Worth of Cryptocurrencies Exploited

BNB Smart Chain Hit by Copycat Vyper Attack, $73K Worth of Cryptocurrencies Exploited

The decentralized finance (DeFi) world has been facing significant challenges in recent times, with various protocols falling victim to exploitations. While Ethereum-based platforms have borne the brunt of these attacks, the BNB Smart Chain (BSC) has also experienced similar vulnerabilities. In this blog, we’ll delve into the recent copycat Vyper attack on BSC, which resulted in a loss of approximately $73,000 worth of cryptocurrencies. We’ll also explore the root cause of the exploit and the steps taken by the community to address the issue. Additionally, we’ll discuss how users can safeguard themselves from such attacks in the future.

The Copycat Vyper Attack

On July 30, Blockchain security firm BlockSec reported that the BNB Smart Chain suffered from a copycat Vyper attack, mirroring the exploit on the popular DeFi protocol, Curve Finance. In total, approximately $73,000 worth of cryptocurrencies was stolen across three separate exploits on BSC.

The Vulnerability in Vyper

The vulnerability was attributed to a malfunctioning reentrancy lock present in versions 0.2.15, 0.2.16, and 0.3.0 of the Vyper programming language. Vyper is widely used in various Web3 projects and was originally designed for the Ethereum Virtual Machine. However, its impact extended beyond Ethereum-based protocols, affecting any projects utilizing the vulnerable Vyper versions.

White Hat and Black Hat Hackers in Action

Following the news of the exploit, a battle ensued between white hat and black hat hackers on-chain. White hat hackers are ethical hackers who aim to identify and fix vulnerabilities before malicious actors exploit them. On the other hand, black hat hackers are those who exploit vulnerabilities for personal gain.

One white hat hacker, known as “c0ffebabe.eth,” managed to secure some funds and announced their willingness to return them to the affected protocols. So far, they have returned nearly 2,900 Ether (ETH) worth over $5 million to Curve Finance in one transaction. This demonstrates the importance of ethical hackers in mitigating the impact of such attacks.

Staying Safe in the World of Web3

The world of Web3 and DeFi is exciting, but it also comes with risks. To protect yourself from potential exploits, here are some essential safety tips:

  • Research Before Investing: Before participating in any DeFi project or protocol, conduct thorough research. Understand the team behind the project, its security features, and community reviews. Look for audits and security assessments conducted by reputable firms.
  • Avoid Unknown Smart Contracts: Be cautious while interacting with unknown or unaudited smart contracts. Hackers often exploit vulnerabilities in such contracts to steal funds.
  • Keep Your Software Updated: Ensure that you are using the latest versions of wallets and applications. Updates often include security patches that protect you from known vulnerabilities.
  • Use Hardware Wallets: Consider using hardware wallets for storing your cryptocurrencies. These wallets provide an extra layer of security, as they are not connected to the internet when not in use.
  • Enable Multi-Factor Authentication (MFA): Enable MFA wherever possible to add an extra layer of protection to your accounts.
  • Use Reputable Platforms: Stick to reputable decentralized exchanges (DEXs) and lending platforms with a track record of security and reliability.


The recent copycat Vyper attack on the BNB Smart Chain highlights the importance of security in the world of DeFi. While such attacks can be devastating, the presence of ethical hackers and a vigilant community can mitigate the damage. By following safety tips and staying informed, users can minimize their exposure to risks and participate in the exciting world of Web3 with confidence. Remember to conduct thorough research, stay updated on the latest security developments, and exercise caution while interacting with unknown smart contracts. Together, we can build a safer and more secure DeFi ecosystem.


What is the BNB Smart Chain Copycat Vyper Attack? 

The BNB Smart Chain Copycat Vyper Attack refers to a series of exploits that occurred on the BNB Smart Chain (BSC) due to a vulnerability in the Vyper programming language. Similar to the attack on the decentralized finance (DeFi) protocol Curve Finance, malicious actors exploited the vulnerability to steal approximately $73,000 worth of cryptocurrencies across three separate incidents on the BSC.

What caused the vulnerability in Vyper programming language? 

The vulnerability was caused by a malfunctioning reentrancy lock present in specific versions of the Vyper programming language, namely versions 0.2.15, 0.2.16, and 0.3.0. Vyper is widely used for Web3 projects and was originally designed for the Ethereum Virtual Machine. However, its impact extended beyond Ethereum-based protocols, making other projects utilizing the affected Vyper versions susceptible to similar attacks.

How was the BNB Smart Chain community responding to the attack? 

The BNB Smart Chain community responded to the attack in a multi-faceted manner. White hat hackers, who are ethical hackers, actively engaged with black hat hackers, who exploit vulnerabilities for personal gain, on-chain. One notable white hat hacker, “c0ffebabe.eth,” was successful in securing some of the stolen funds and expressed their willingness to return them to the affected protocols. As a part of the response, community members were encouraged to remain vigilant, and ongoing efforts were made to identify vulnerabilities, conduct audits, and implement security measures to strengthen the BSC ecosystem and prevent future attacks.

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