What is CVE-2018-0681?

CVE-2018-0681 is a critical-severity vulnerability in Neo Debun Imap, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2018-11-15.

How severe is CVE-2018-0681?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Neo Debun Imap

CVE-2018-0681

Denbun by NEOJAPAN Inc. (Denbun POP version V3.3P R4.0 and earlier, Denbun IMAP version V3.3I R4.0 and earlier) uses hard-coded credentials, which may allow remote attackers to login to the Management page and change the configuration.

Published 2018-11-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Neo Debun Imap
Neo Debun Pop
Neojapan Inc. Denbun By (Denbun Pop Version V3.3p R4.0 And Earlier, Imap V3.3i Earlier) — versions Denbun POP version V3.3P R4.0 and earlier, Denbun IMAP version V3.3I R4.0 and earlier

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

www.denbun.com/en/pop/support/security/181003.html (Vendor Advisory)
jvn.jp/en/jp/JVN00344155/index.html (Third Party Advisory, third-party-advisory)
www.denbun.com/en/imap/support/security/181003.html (Vendor Advisory)

Frequently asked questions

What is CVE-2018-0681?: CVE-2018-0681 is a critical-severity vulnerability in Neo Debun Imap, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2018-11-15.
How severe is CVE-2018-0681?: Critical severity. CVSS v3 base score is 9.8 out of 10.