CVE-2018-0680

CRITICALNVD 9.89.8—Trending — 3 sources updated this week

9.8

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 read/send mail or change the configuration.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 76.9%
KEV: Not listed

Published

November 15, 2018

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated May 28, 2026

No patch confirmed yet.

generic

Denbun POP - Important Information | Denbun, The Next Generation WebMail System

https://www.denbun.com/en/pop/support/security/181003.html

generic

Denbun IMAP - Important Information | Denbun, The Next Generation WebMail System

https://www.denbun.com/en/imap/support/security/181003.html

generic

JVN#00344155: Multiple vulnerabilities in Denbun

http://jvn.jp/en/jp/JVN00344155/index.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-798Use of Hard-coded Credentials

Data Freshness Timeline

(refreshed 12× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 01:05 UTCEG score recompute
2026-05-28 01:04 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-0680?

CVE-2018-0680 is a critical vulnerability published on November 15, 2018. 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 read/send mail or change the configuration.

When was CVE-2018-0680 disclosed?

CVE-2018-0680 was first published in the National Vulnerability Database on November 15, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-0680 actively exploited?

CVE-2018-0680 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 76.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-0680?

CVE-2018-0680 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2018-0680?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0680, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-0680

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

Denbun POP - Important Information | Denbun, The Next Generation WebMail System

Denbun IMAP - Important Information | Denbun, The Next Generation WebMail System

JVN#00344155: Multiple vulnerabilities in Denbun

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-0680?

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Published

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Advisory Details (3)

Frequently asked(5)

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