CVE-2018-6522: In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKRgFtXp.SYS) allows local users to cause a denial of s

Routine

HIGH 7.8UPGRADE

CVE-2018-6522 is a high-severity flaw (CVSS 7.8) affecting nprotect avs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKRgFtXp.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x220408.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-02-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: inca

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

Am I affected?

Timeline

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

inca nprotect avs UPGRADE

Affected: >= 4.0 and < 4.0.0.39

Fixed in: 4.0.0.39

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy nprotect-avs || rpm -q nprotect-avs || nprotect-avs --version

2. UPGRADE to 4.0.0.39 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nprotect-avs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nprotect-avs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison nprotect-avs sudo apt install nprotect-avs=<VERSION_BEFORE_4.0> sudo apt-mark hold nprotect-avs

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nprotect-avs sudo dnf downgrade nprotect-avs-<VERSION_BEFORE_4.0> sudo dnf versionlock add nprotect-avs

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-2018-6522?

nprotect avs: upgrade to 4.0.0.39. Exact commands for each OS are on this page.

Is CVE-2018-6522 being exploited?

CVE-2018-6522 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-2018-6522 affect?

CVE-2018-6522 affects nprotect avs. Severity is high (CVSS 7.8). In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKRgFtXp.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x220408.

How urgent is CVE-2018-6522?

Priority 34/100. High severity

Related CVEs

CVE-2018-6525 HIGH 7.8 UPGRADE In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKFsAv.SYS) allows local users to cause a denial of ser
CVE-2018-6524 HIGH 7.8 UPGRADE In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKFsAv.SYS) allows local users to cause a denial of ser
CVE-2018-6523 HIGH 7.8 UPGRADE In nProtect AVS V4.0 before 4.0.0.39, the driver file (TKFsAv.SYS) allows local users to cause a denial of ser

References

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