CVE-1999-1109

Summary

CVE-1999-1109 is a denial-of-service vulnerability affecting Sendmail versions before 8.10.0. Malicious actors can cause the server to become unresponsive by sending a series of ETRN (Extended Mail From) commands, followed by disconnecting from the server. Sendmail continues to process these commands after the connection has been terminated, resulting in a resource exhaustion attack, rendering the server unavailable to legitimate users. This issue poses a significant risk to organizations using unpatched Sendmail servers and highlights the importance of keeping email servers up-to-date to protect against known vulnerabilities.

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