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More than 280 blockchain networks are at risk of “zero-day” exploits that could put at least $25 billion worth of crypto at risk, according to cybersecurity firm Halborn.

Cointelegraph writes a 13 March blog post from Halborn warned of the vulnerability it dubbed “Rab13s” — adding it has already worked with some blockchains, such as Dogecoin, Litecoin and Zcash, to institute a fix for it.

Halborn said it was contracted in March 2022 to conduct a security review of Dogecoin’s codebase and found “several critical and exploitable vulnerabilities.”

It later determined those same vulnerabilities “affected over 280 other networks” that risked billions of dollars’ worth of cryptocurrencies.

Halborn outlined three vulnerabilities, the “most critical” of which allows an attacker to “send crafted malicious consensus messages to individual nodes, causing each to shut down.”

It added these messages over time could expose the blockchain to a 51% attack where an attacker controls the majority of the network’s mining hash rate or staked tokens to make a new version of the blockchain or take it offline.

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