CVE-2018-0683: Neo Debun Imap

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

Buffer overflow in Denbun by NEOJAPAN Inc. (Denbun POP version V3.3P R4.0 and earlier, Denbun IMAP version V3.3I R4.0 and earlier) allows remote attackers to execute arbitrary code or cause a denial-of-service (DoS) condition via Cookie data.

Affected products

• Neo Debun Imap: up to and including 3.3i_r4.0
• Neo Debun Pop: up to and including 3.3p_r4.0

Published 2018-11-15. Last modified 2026-06-17.