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When the Microsoft SMTP service attempts to send a message to a server and receives a 4xx error code, it quickly and repeatedly attempts to redeliver the message, causing a denial of service.
| Base Score | 5 |
|---|---|
| Vector String | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| Base Severity | Unknown |
| Version | 2.0 |
| Attack Vector (AV) |
