The remote host is vulnerable to a buffer overflow.
The remote host is running ClamAV, an antivirus application. There is a remote buffer overflow within this version of ClamAV. Specifically, if an attacker were able to spoof or gain control of a ClamAV update server, the attacker could craft a malicious HTTP response that would trigger a buffer overflow. Successful exploitation would result in the execution of arbitrary code.
Upgrade to version 0.88.2 or higher.