Security News > 2021 > May > Critical 21Nails Exim bugs expose millions of servers to attacks
Newly discovered critical vulnerabilities in the Exim mail transfer agent software allow unauthenticated remote attackers to execute arbitrary code and gain root privilege on mail servers with default or common configurations.
All versions released before Exim 4.94.2 are vulnerable to attacks attempting to exploit the 21Nails vulnerabilities.
MTA servers such as Exim are an easy target to attacks given that, in most cases, they are reachable over the Internet and provide attackers with a simple entry point into a target's network.
According to the survey, it is installed on more than 59% out of a total of 1,084,800 mail servers reachable on the Internet, representing just over 344,026 Exim servers.
If not patched as soon as possible, all these servers could fall victim to incoming remote command execution attacks if not urgently patched against the 21Nails vulnerabilities.
All Exim users should immediately upgrade to the latest available Exim version to block any incoming attack targeting their vulnerable servers.
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