CVE-2006-0138

CVE-2006-0138 describes a denial-of-service vulnerability in aMSN (Alvaro's Messenger) that allows a remote attacker to crash a client's application and terminate their instant-messaging session. This is achieved by repeatedly sending malformed data to the default file-transfer port (TCP 6891). The vulnerability has a CVSS score of 5.0, indicating a medium severity, with low attack complexity and no authentication required, leading to a partial availability impact. While not listed on the KEV catalog, an exploit is publicly available on ExploitDB, though there is no evidence of active exploitation or significant community discussion.