CVE-2018-6766: Swisscom TVMediaHelper 1.1.0.50 contains a vulnerability that could allow an unauthenticated, remote attacker

This month

HIGH 7.8DOWNGRADE

CVE-2018-6766 is a high-severity flaw (CVSS 7.8) affecting tvmediahelper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Swisscom TVMediaHelper 1.1.0.50 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on the targeted system. This vulnerability exists due to the way .dll files are loaded. It allows an attacker to load a .dll of the attacker's choosing that could execute arbitrary code without the user's knowledge. The specific flaw exists within the handling of several DLLs (dwmapi.dll, PROPSYS.dll, cscapi.dll,

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-427
Published	2018-03-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: swisscom

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

Am I affected?

Timeline

2018-03-27 17:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

swisscom tvmediahelper DOWNGRADE

Affected: 1.1.0.50

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.0.50

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1.0.50 (Debian / Ubuntu)

apt-cache madison tvmediahelper sudo apt install tvmediahelper=<VERSION_BEFORE_1.1.0.50> sudo apt-mark hold tvmediahelper

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

dnf --showduplicates list tvmediahelper sudo dnf downgrade tvmediahelper-<VERSION_BEFORE_1.1.0.50> sudo dnf versionlock add tvmediahelper

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-2018-6766?

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

Is CVE-2018-6766 being exploited?

CVE-2018-6766 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-2018-6766 affect?

CVE-2018-6766 affects tvmediahelper. Severity is high (CVSS 7.8). Swisscom TVMediaHelper 1.1.0.50 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on the targeted system. This vulnerability exists due to the way .dll files are loaded. It allows an att

How urgent is CVE-2018-6766?

Priority 41/100. High severity

References

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