What is CVE-2018-16166?

CVE-2018-16166 is a high-severity vulnerability in Jpcert Logontracer, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 8.8/10. Published 2019-01-09.

How severe is CVE-2018-16166?

High severity. CVSS v3 base score is 8.8 out of 10.

XXE in Jpcert Logontracer

CVE-2018-16166

LogonTracer 1.2.0 and earlier allows remote attackers to conduct XML External Entity (XXE) attacks via unspecified vectors.

Vulnerability class: XXE (XML External Entity)

Published 2019-01-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Jpcert Logontracer
Jpcert Coordination Center Logontracer — versions 1.2.0 and earlier

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

github.com/JPCERTCC/LogonTracer/releases/tag/v1.2.1 (Third Party Advisory, Release Notes)
jvn.jp/en/vu/JVNVU98026636/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2018-16166?: CVE-2018-16166 is a high-severity vulnerability in Jpcert Logontracer, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 8.8/10. Published 2019-01-09.
How severe is CVE-2018-16166?: High severity. CVSS v3 base score is 8.8 out of 10.