What is CVE-2018-15509?

CVE-2018-15509 is a critical-severity vulnerability in Five9 Agent Desktop Plus, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 9.8/10. Published 2019-03-18.

How severe is CVE-2018-15509?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Five9 Agent Desktop Plus

CVE-2018-15509

Five9 Agent Desktop Plus 10.0.70 has Incorrect Access Control (issue 2 of 2).

Published 2019-03-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Five9 Agent Desktop Plus — versions 10.0.70

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

0tkombo.wixsite.com/0tkombo/blog/five9-dos-websocket-access (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-15509?: CVE-2018-15509 is a critical-severity vulnerability in Five9 Agent Desktop Plus, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 9.8/10. Published 2019-03-18.
How severe is CVE-2018-15509?: Critical severity. CVSS v3 base score is 9.8 out of 10.