In their quest for network access, cyber threat actors are leveraging a broad spectrum of vulnerabilities, from the most recently disclosed to those left unpatched for over two decades.
In its 2025 Mass Internet Exploitation Report, released on February 27, GreyNoise found that 40% of vulnerabilities exploited by attackers in 2024 were from 2020 or earlier and 10% from 2016 or earlier. Some even date back to the late 1990s, like CVE-1999-0526 – an X server vulnerability.
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