CVE-2018-15509: Five9 Agent Desktop Plus 10.0.70 has Incorrect Access Control (issue 2 of 2).

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-15509 is a critical-severity flaw (CVSS 9.8) affecting agent desktop plus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-732
Published	2019-03-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: five9

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-03-18 01:32 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

five9 agent desktop plus DOWNGRADE

Affected: 10.0.70

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0.70

1. Check installed version

apt-cache policy agent-desktop-plus || rpm -q agent-desktop-plus || agent-desktop-plus --version

2. No fixed release: DOWNGRADE to a release before 10.0.70 (Debian / Ubuntu)

apt-cache madison agent-desktop-plus sudo apt install agent-desktop-plus=<VERSION_BEFORE_10.0.70> sudo apt-mark hold agent-desktop-plus

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list agent-desktop-plus sudo dnf downgrade agent-desktop-plus-<VERSION_BEFORE_10.0.70> sudo dnf versionlock add agent-desktop-plus

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-15509?

agent desktop plus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15509 being exploited?

CVE-2018-15509 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-15509 affect?

CVE-2018-15509 affects agent desktop plus. Severity is critical (CVSS 9.8). Five9 Agent Desktop Plus 10.0.70 has Incorrect Access Control (issue 2 of 2).

How urgent is CVE-2018-15509?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-15508 HIGH 7.5 DOWNGRADE Five9 Agent Desktop Plus 10.0.70 has Incorrect Access Control allowing a remote attackers to cause a denial of

References

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