CVE-2018-15738: An issue was discovered in STOPzilla AntiMalware 6.5.2.59

Routine

MEDIUM 5.5DOWNGRADE

CVE-2018-15738 is a medium-severity flaw (CVSS 5.5) affecting antimalware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in STOPzilla AntiMalware 6.5.2.59. The driver file szkg64.sys contains an Arbitrary Write vulnerability due to not validating the output buffer address value from IOCtl 0x8000205F.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-07-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: stopzilla

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

Am I affected?

Timeline

2019-07-09 13:15 UTCPublished CVE record published
2026-06-17 01:43 UTCUpdated Record last modified

stopzilla antimalware DOWNGRADE

Affected: 6.5.2.59

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.5.2.59

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.5.2.59 (Debian / Ubuntu)

apt-cache madison antimalware sudo apt install antimalware=<VERSION_BEFORE_6.5.2.59> sudo apt-mark hold antimalware

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

dnf --showduplicates list antimalware sudo dnf downgrade antimalware-<VERSION_BEFORE_6.5.2.59> 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-2018-15738?

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

Is CVE-2018-15738 being exploited?

CVE-2018-15738 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-2018-15738 affect?

CVE-2018-15738 affects antimalware. Severity is medium (CVSS 5.5). An issue was discovered in STOPzilla AntiMalware 6.5.2.59. The driver file szkg64.sys contains an Arbitrary Write vulnerability due to not validating the output buffer address value from IOCtl 0x8000205F.

How urgent is CVE-2018-15738?

Priority 34/100. Public exploit reference

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References

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