CVE-2017-5909: The Electronic Funds Source (EFS) Mobile Driver Source app 2.5 for iOS does not verify X.509 certificates from

Routine

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-5909 is a medium-severity flaw (CVSS 5.9) affecting efs mobile driver source. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Electronic Funds Source (EFS) Mobile Driver Source app 2.5 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	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-295
Published	2017-05-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: electronic funds source llc

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

Am I affected?

Timeline

2017-05-05 07:29 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

electronic funds source llc efs mobile driver source DOWNGRADE

Affected: 2.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5

1. Check installed version

apt-cache policy efs-mobile-driver-source || rpm -q efs-mobile-driver-source || efs-mobile-driver-source --version

2. No fixed release: DOWNGRADE to a release before 2.5 (Debian / Ubuntu)

apt-cache madison efs-mobile-driver-source sudo apt install efs-mobile-driver-source=<VERSION_BEFORE_2.5> sudo apt-mark hold efs-mobile-driver-source

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

dnf --showduplicates list efs-mobile-driver-source sudo dnf downgrade efs-mobile-driver-source-<VERSION_BEFORE_2.5> sudo dnf versionlock add efs-mobile-driver-source

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-2017-5909?

efs mobile driver source: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-5909 being exploited?

CVE-2017-5909 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-2017-5909 affect?

CVE-2017-5909 affects efs mobile driver source. Severity is medium (CVSS 5.9). The Electronic Funds Source (EFS) Mobile Driver Source app 2.5 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-2017-5909?

Priority 36/100. Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities

References

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