In late October 2026, Binance suffered a cyberattack. The Kobeissi Letter said about $5.7 billion in funds flowed out of Binance afterward and called it the largest cyberattack in cryptocurrency history. Elon Musk responded on X with "Every day is zeroday." Reports caution that the $5.7 billion figure is not confirmed theft; it may include users moving funds to other platforms or personal wallets.
Musk's comment reflects the nature of zero-day vulnerabilities — unknown flaws that give vendors no time to patch before attackers can exploit them. The episode highlights that crypto exchanges and digital platforms face continuous security threats, and large outflows during an incident are not automatically all stolen funds.
A zero-day is a software vulnerability unknown to the vendor or developer, so defenders have zero days to fix it before attackers can exploit it. Musk's "Every day is a zero-day" comment uses the term correctly. This is promotional marketing for eScan's antivirus products, not a factual claim that can be verified.
Binance did suffer a cyberattack in late October 2026. Reports put outflows or associated wallet movements at roughly $5.7–$5.78 billion, but those figures are not confirmed theft — they may include users moving funds to other platforms or personal wallets. This is a promotional post for a Withum cybersecurity newsletter, not a checkable factual claim.
MOne crypto account just explained what a zero-day is, and the internet roasted them for it.
CBecause the internet is allergic to anyone learning something.
MTCC on X posted after Elon wrote, "Every day is a zero-day."
MIt defined zero-day as a vulnerability defenders haven't had time to fix because it was previously unknown.
CCorrect. And the top reply basically says he just discovered the vulnerability database.
MOkay, that's funny. But not everyone lives in security Twitter.
CIf you follow Elon and crypto, you've heard zero-day a hundred times.
MHearing it and understanding it are different. Half of those people think it means a day off.
CIt's not hard. Unknown flaw, no patch, attackers win. The end.
MThen why do normal people fall for "zero-day protection" ads?
CBecause they don't read. A tweet won't fix that.
MTCC's explanation was clear, accurate, and took five seconds. What's the harm?
CIt's engagement bait. Post a definition, get a thousand replies saying "duh."
MOh, so now definitions are engagement bait? You sound like the cynical reply guy.
CI'm not cynical. I just think the post is unnecessary for its audience.
MThe audience is people who saw Elon's post and went "what?" That's real.
CFine. One useful tweet. But the replies are still the best part.
M"Duh." That's not wit, Chris. That's just being rude.
CIt's concise. The whole reply section is one word. It's art.
MYou're impossible. The explanation was fine. The pile-on was lazy.
CI'd argue the pile-on is the actual content. It proves everyone already knew.
MIt proves the replies are performative. People love acting bored.
CThey're not acting. Zero-day has been standard jargon for twenty years.
MStandard in cybersecurity. Not standard for the guy who trades crypto.
CThe guy who trades crypto should know the risk. His money depends on it.
MThat's exactly why a clear explainer is useful! Not everyone got the memo.
CFine. Maybe it helps one person. But one "duh" reply is still funny.
MYou're defending a one-word insult. That's where we are.
CI'm defending efficiency. The reply said what half the timeline thought.
MIt could have said nothing. That's even more efficient.
CNow you sound like the reply guy.
MThe actual zero-day market is scary. Flaws sold to attackers before vendors know.
CThat's the point of the term. Zero days to patch. It's a constant race.
MAnd the post did its job: it reminded people that new threats appear anytime.
CI'll give it that. One clear explanation beats a hundred vague warnings.
MSo maybe no one should have dunked on TCC.
CI still liked the dunk. But the explanation was fine.