CVE-2015-6839: The parse function in MSA vot.Ar 3.1 does not check whether a candidate receives more than one vote, which all

Routine

MEDIUM 4.6DOWNGRADE

CVE-2015-6839 is a medium-severity flaw (CVSS 4.6) affecting vot.ar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The parse function in MSA vot.Ar 3.1 does not check whether a candidate receives more than one vote, which allows physically proximate attackers to cast multiple votes for a candidate via a crafted RFID ballot tag.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-10-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: grupo msa

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

Am I affected?

Timeline

2017-10-23 18:29 UTCPublished CVE record published
2026-06-17 00:31 UTCUpdated Record last modified

grupo msa vot.ar DOWNGRADE

Affected: 3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

1. Check installed version

apt-cache policy vot.ar || rpm -q vot.ar || vot.ar --version

2. No fixed release: DOWNGRADE to a release before 3.1 (Debian / Ubuntu)

apt-cache madison vot.ar sudo apt install vot.ar=<VERSION_BEFORE_3.1> sudo apt-mark hold vot.ar

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

dnf --showduplicates list vot.ar sudo dnf downgrade vot.ar-<VERSION_BEFORE_3.1> sudo dnf versionlock add vot.ar

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-2015-6839?

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

Is CVE-2015-6839 being exploited?

CVE-2015-6839 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-2015-6839 affect?

CVE-2015-6839 affects vot.ar. Severity is medium (CVSS 4.6). The parse function in MSA vot.Ar 3.1 does not check whether a candidate receives more than one vote, which allows physically proximate attackers to cast multiple votes for a candidate via a crafted RFID ballot tag.

How urgent is CVE-2015-6839?

Priority 25/100. No elevated risk signals yet.

References

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