CVE-2017-8939: The Warner Bros

Routine

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-8939 is a medium-severity flaw (CVSS 5.9) affecting ellentube. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Warner Bros. ellentube app 3.1.1 through 3.1.3 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-295
Published	2017-05-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: warnerbros

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

Am I affected?

Timeline

2017-05-15 18:29 UTCPublished CVE record published
2026-06-17 01:27 UTCUpdated Record last modified

warnerbros ellentube DOWNGRADE

Affected: 3.1.1 · 3.1.2 · 3.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1.1 (Debian / Ubuntu)

apt-cache madison ellentube sudo apt install ellentube=<VERSION_BEFORE_3.1.1> sudo apt-mark hold ellentube

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

dnf --showduplicates list ellentube sudo dnf downgrade ellentube-<VERSION_BEFORE_3.1.1> sudo dnf versionlock add ellentube

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-2017-8939?

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

Is CVE-2017-8939 being exploited?

CVE-2017-8939 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-2017-8939 affect?

CVE-2017-8939 affects ellentube. Severity is medium (CVSS 5.9). The Warner Bros. ellentube app 3.1.1 through 3.1.3 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

How urgent is CVE-2017-8939?

Priority 38/100. Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities

References

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