Security News > 2025 > January > One of Salt Typhoon's favorite flaws still wide open on 91% of at-risk Exchange Servers

But we mean, you've had nearly four years to patch One of the critical security flaws exploited by China's Salt Typhoon to breach US telecom and government networks has had a patch available for nearly four years - yet despite repeated warnings from law enforcement and private-sector security firms, nearly all public-facing Microsoft Exchange Server instances with this vulnerability remain unpatched.…

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https://go.theregister.com/feed/www.theregister.com/2025/01/23/proxylogon_flaw_salt_typhoons_open/