CTI · corroborated · 2026-09-21

Exim Mail Server 4.100.1 Patches Four Vulnerabilities Including SMTP Smuggling

Full story & timeline

MITRE ATT&CK

• T1190 Exploit Public-Facing Application Initial Access
• T1565 Data Manipulation Impact

Indicators

No curated indicators tied to this case.

Detections

No detection content yet — case analysis did not yield signal-specific telemetry. Check back after the next daily CTI pass.

References

• https://www.exim.org