What is CVE-2019-5977?

CVE-2019-5977 is a medium-severity vulnerability in Cybozu Garoon, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2019-09-12.

How severe is CVE-2019-5977?

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

Vulnerability in Cybozu Garoon

CVE-2019-5977

Mail header injection vulnerability in Cybozu Garoon 4.0.0 to 4.10.2 may allow a remote authenticated attackers to alter mail header via the application 'E-Mail'.

Published 2019-09-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Cybozu Garoon
Inc." Cybozu Garoon — versions 4.0.0 to 4.10.2

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

jvn.jp/en/jp/JVN62618482/index.html (Third Party Advisory)
kb.cybozu.support/article/35915 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-5977?: CVE-2019-5977 is a medium-severity vulnerability in Cybozu Garoon, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.3/10. Published 2019-09-12.
How severe is CVE-2019-5977?: Medium severity. CVSS v3 base score is 4.3 out of 10.