CVE-1999-0419: When the Microsoft SMTP service attempts to send a message to a server and receives a 4xx error code, it quickly and rep

Published n/a Updated 2026-08-21T04:30:43.445Z

Summary

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.

Severity

UNKNOWN

Source Attribution

Source: NVD · Updated: 2026-08-21T04:30:43.445Z · Confidence: high

Impact

Based on CVSS vector: n/a — assess confidentiality, integrity, and availability impact via the official vector documentation.

Affected Software

Fix

Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.

References