What is CVE-2018-3881?

CVE-2018-3881 is a critical-severity vulnerability in Focalscope, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.4/10. Published 2018-08-01.

How severe is CVE-2018-3881?

Critical severity. CVSS v3 base score is 9.4 out of 10.

XXE in Focalscope

CVE-2018-3881

An exploitable unauthenticated XML external injection vulnerability was identified in FocalScope v2416. A unauthenticated attacker could submit a specially crafted web request to FocalScope's server that could cause an XXE, and potentially result in data compromise.

Vulnerability class: XXE (XML External Entity)

Published 2018-08-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.0th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Focalscope — versions 2416, v2416

Weakness classification (CWE)

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

References

www.talosintelligence.com/vulnerability_reports/TALOS-2018-0559 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-3881?: CVE-2018-3881 is a critical-severity vulnerability in Focalscope, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.4/10. Published 2018-08-01.
How severe is CVE-2018-3881?: Critical severity. CVSS v3 base score is 9.4 out of 10.