CVE-2018-6014: Subsonic v6.1.3 has an insecure allow-access-from domain="*" Flash cross-domain policy that allows an attacker

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MEDIUM 6.5DOWNGRADE

CVE-2018-6014 is a medium-severity flaw (CVSS 6.5) affecting subsonic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Subsonic v6.1.3 has an insecure allow-access-from domain="*" Flash cross-domain policy that allows an attacker to retrieve sensitive user information via a read request. To exploit this issue, an attacker must convince the user to visit a web site loaded with a SWF file created specifically to steal user data.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-01-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: subsonic

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

Am I affected?

Timeline

2018-01-23 00:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

subsonic subsonic DOWNGRADE

Affected: 6.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.1.3

1. Check installed version

apt-cache policy subsonic || rpm -q subsonic || subsonic --version

2. No fixed release: DOWNGRADE to a release before 6.1.3 (Debian / Ubuntu)

apt-cache madison subsonic sudo apt install subsonic=<VERSION_BEFORE_6.1.3> sudo apt-mark hold subsonic

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

dnf --showduplicates list subsonic sudo dnf downgrade subsonic-<VERSION_BEFORE_6.1.3> sudo dnf versionlock add subsonic

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-2018-6014?

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

Is CVE-2018-6014 being exploited?

CVE-2018-6014 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-2018-6014 affect?

CVE-2018-6014 affects subsonic. Severity is medium (CVSS 6.5). Subsonic v6.1.3 has an insecure allow-access-from domain="*" Flash cross-domain policy that allows an attacker to retrieve sensitive user information via a read request. To exploit this issue, an attacker must convince the user to visit a w

How urgent is CVE-2018-6014?

Priority 45/100. Public exploit reference

Related CVEs

CVE-2018-9282 MEDIUM 6.1 DOWNGRADE An XSS issue was discovered in Subsonic Media Server 6.1.1
CVE-2018-20228 HIGH 8.0 DOWNGRADE Subsonic V6.1.5 allows internetRadioSettings.view streamUrl CSRF, with resultant SSRF.
CVE-2018-14691 MEDIUM 6.1 DOWNGRADE An issue was discovered in Subsonic 6.1.1
CVE-2018-14690 MEDIUM 6.1 DOWNGRADE An issue was discovered in Subsonic 6.1.1
CVE-2018-14689 MEDIUM 6.1 DOWNGRADE An issue was discovered in Subsonic 6.1.1

References

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