What is CVE-2016-4841?

CVE-2016-4841 is a medium-severity vulnerability in Cybozu Mailwise, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2017-04-21.

How severe is CVE-2016-4841?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Improper input validation in Cybozu Mailwise

CVE-2016-4841

Cybozu Mailwise before 5.4.0 allows remote attackers to inject arbitrary email headers.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.015 (72.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Cybozu Mailwise — versions 5.0.0, 5.0.1, 5.0.4

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support.cybozu.com/ja-jp/article/9607 (Vendor Advisory)
www.securityfocus.com/bid/92459 (VDB Entry, Third Party Advisory, vdb-entry)
jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000135.html (VDB Entry, Third Party Advisory, third-party-advisory)
jvn.jp/en/jp/JVN01353821/index.html (VDB Entry, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2016-4841?: CVE-2016-4841 is a medium-severity vulnerability in Cybozu Mailwise, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2017-04-21.
How severe is CVE-2016-4841?: Medium severity. CVSS v3 base score is 4.3 out of 10.