How severe is CVE-2018-15509?

CVE-2018-15509 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-15509 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15509?

CVE-2018-15509 affects Five9 Agent Desktop Plus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-15509?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-15509 published?

CVE-2018-15509 was published on 2019-03-18 and last updated on 2026-06-17.

CVE-2018-15509

CVE-2018-15509 is a critical-severity vulnerability in Five9 Agent Desktop Plus with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Five9 Agent Desktop Plus
Published: 2019-03-18
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2018-15509?: Five9 Agent Desktop Plus 10.0.70 has Incorrect Access Control (issue 2 of 2).
How severe is CVE-2018-15509?: CVE-2018-15509 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-15509 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15509?: CVE-2018-15509 affects Five9 Agent Desktop Plus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-15509?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-15509 published?: CVE-2018-15509 was published on 2019-03-18 and last updated on 2026-06-17.

References

https://0tkombo.wixsite.com/0tkombo/blog/five9-dos-websocket-access

Affected products (1)

cpe:2.3:a:five9:agent_desktop_plus:10.0.70:*:*:*:*:*:*:*

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