Update (November 21, 11:30 AM UTC): This article has been updated to include clarification from Sui Network regarding downtime.
Sui, a decentralized layer 1 blockchain designed for rapid smart contract deployment, experienced a severe outage on November 21, halting block production for more than an hour.
According to data from Sui network explorer SuiVision, the Sui blockchain has been down for more than an hour without any blocks being created.
According to the data, the last block occurred at 9:15 AM UTC and no new blocks were created after that.
These are the last three transaction blocks on the Sui blockchain. Source: SuiVision
Several industry observers reacted to the downtime, with many describing Sui’s ambitions to become one of the biggest competitors to Solana (SOL), the fourth-largest cryptocurrency by market capitalization.
“SUI blockchain is down. And they claimed to be the Solana killer.” Cryptocurrency YouTuber Ajay Kashyap wrote on
The exchange will disable SUI deposits and withdrawals during the outage period.
The downtime also affected the blockchain’s native cryptocurrency, Sui (SUI), which fell nearly 11%, according to data from CoinGecko. Despite this, it’s trading around $3.40 and is still up about 75% in the last 30 days.
SUI 24 hour price chart. Source: CoinGecko
Some major exchanges have also reacted to Sui blockchain issues. Upbit, a domestic cryptocurrency exchange, temporarily suspended SUI deposits and withdrawals due to network problems.
The Sui Foundation visited
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“We have identified the issue and a fix will be deployed soon,” the foundation said.
source: sui network
Is there a DOS bug behind the outage?
According to some cryptocurrency security companies, the Sui blockchain outage is likely due to a DOS bug in the system.
“Analysis revealed that a Sui Network node caused a DOS due to an integer overflow,” Web3 security company ExVul said in the X post.
The Sui network reportedly experienced a DOS bug. source: ExVul
ExVul also mentioned the location of the suspected bug on GitHub and suggested a fix patch code.
Sui is back online after two hours of downtime.
After a two-hour outage, the Sui Foundation visited X and announced that Sui was back up and processing transactions “thanks to the quick work of the Sui validator community.”
According to the foundation, the downtime was caused by a bug in the transaction scheduling logic that caused a validator crash, which has now been resolved.
With the Sui network back online, the SUI price is trading around $3.60 as of this writing, having all but erased its daily losses, according to CoinGecko.
“First major disruption to SUI”
According to Tim Kravchunovsky, founder and CEO of Chirp, a Sui-based decentralized communications network, Sui has experienced similar outages before, but only on testnet.
“The testnet network went down for several hours in March 2024, and another testnet outage occurred in June 2024. In July, our public RPC node crashed when trying to submit a transaction, which was resolved in about 1.5 hours.” Kravchunovsky told Cointelegraph.
“But this is the first major power outage we have ever experienced,” he added.
“Every blockchain aims to completely prevent such incidents, and downtime is never welcome. But sometimes interruptions are unavoidable, like losing your internet connection.”
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