What is CVE-2018-18958?

CVE-2018-18958 is a medium-severity vulnerability in Opnsense, classified under Improper Access Control. CVSS score: 6.5/10. Published 2019-06-17.

How severe is CVE-2018-18958?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Opnsense

CVE-2018-18958

OPNsense 18.7.x before 18.7.7 has Incorrect Access Control.

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Opnsense

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

forum.opnsense.org/index.php (Release Notes, Vendor Advisory)
forum.opnsense.org/index.php (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2018-18958?: CVE-2018-18958 is a medium-severity vulnerability in Opnsense, classified under Improper Access Control. CVSS score: 6.5/10. Published 2019-06-17.
How severe is CVE-2018-18958?: Medium severity. CVSS v3 base score is 6.5 out of 10.