CVE-2019-6739: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Malwarebyt

This week

HIGH 8.8DOWNGRADE

CVE-2019-6739 is a high-severity flaw (CVSS 8.8) affecting antimalware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Malwarebytes Antimalware 3.6.1.2711. User interaction is required to exploit this vulnerability in that the target must visit a malicious web page. There is an issue with the way the product handles URIs within certain schemes. The product does not warn the user that a dangerous navigation is about to take place. Because special characters in the U

Why this priority

High severity
EPSS top 4%: very likely to be exploited

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	9.9% (top 4%)
CISA exploited list	No
Weakness	CWE-78, CWE-77
Published	2019-06-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: malwarebytes

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

Am I affected?

Timeline

2019-06-03 18:29 UTCPublished CVE record published
2026-06-17 02:39 UTCUpdated Record last modified

malwarebytes antimalware DOWNGRADE

Affected: 3.6.1.2711

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6.1.2711

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.6.1.2711 (Debian / Ubuntu)

apt-cache madison antimalware sudo apt install antimalware=<VERSION_BEFORE_3.6.1.2711> sudo apt-mark hold antimalware

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

dnf --showduplicates list antimalware sudo dnf downgrade antimalware-<VERSION_BEFORE_3.6.1.2711> sudo dnf versionlock add antimalware

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-2019-6739?

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

Is CVE-2019-6739 being exploited?

CVE-2019-6739 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-2019-6739 affect?

CVE-2019-6739 affects antimalware. Severity is high (CVSS 8.8). This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Malwarebytes Antimalware 3.6.1.2711. User interaction is required to exploit this vulnerability in that the target must visit a malicious we

How urgent is CVE-2019-6739?

Priority 55/100. High severity; EPSS top 4%: very likely to be exploited

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References

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