CVE-2018-20331: Local attackers can trigger a Kernel Pool Buffer Overflow in Antiy AVL ATool v1.0.0.22

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HIGH 7.8DOWNGRADE

CVE-2018-20331 is a high-severity flaw (CVSS 7.8) affecting anti virus lab atool. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Local attackers can trigger a Kernel Pool Buffer Overflow in Antiy AVL ATool v1.0.0.22. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the processing of IOCTL 0x80002004 by the ssdt.sys kernel driver. The bug is caused by failure to properly validate the length of the user-supplied data. An attacker can leverage this vulnerabilit

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-12-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: antiy

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

Am I affected?

Timeline

2018-12-23 02:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

antiy anti virus lab atool DOWNGRADE

Affected: 1.0.0.22

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.22

1. Check installed version

apt-cache policy anti-virus-lab-atool || rpm -q anti-virus-lab-atool || anti-virus-lab-atool --version

2. No fixed release: DOWNGRADE to a release before 1.0.0.22 (Debian / Ubuntu)

apt-cache madison anti-virus-lab-atool sudo apt install anti-virus-lab-atool=<VERSION_BEFORE_1.0.0.22> sudo apt-mark hold anti-virus-lab-atool

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

dnf --showduplicates list anti-virus-lab-atool sudo dnf downgrade anti-virus-lab-atool-<VERSION_BEFORE_1.0.0.22> sudo dnf versionlock add anti-virus-lab-atool

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-2018-20331?

anti virus lab atool: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20331 being exploited?

CVE-2018-20331 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-2018-20331 affect?

CVE-2018-20331 affects anti virus lab atool. Severity is high (CVSS 7.8). Local attackers can trigger a Kernel Pool Buffer Overflow in Antiy AVL ATool v1.0.0.22. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw

How urgent is CVE-2018-20331?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2018-19650 HIGH 7.8 DOWNGRADE Local attackers can trigger a stack-based buffer overflow on vulnerable installations of Antiy-AVL ATool secur

References

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