CVE-2017-17804: In IKARUS anti.virus 2.16.20, the driver file (ntguard.SYS) allows local users to cause a denial of service (B

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HIGH 7.8DOWNGRADE

CVE-2017-17804 is a high-severity flaw (CVSS 7.8) affecting anti.virus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In IKARUS anti.virus 2.16.20, the driver file (ntguard.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 0x83000084.

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	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ikarussecurity

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

Am I affected?

Timeline

2017-12-20 09:29 UTCPublished CVE record published
2026-06-17 01:11 UTCUpdated Record last modified

ikarussecurity anti.virus DOWNGRADE

Affected: 2.16.20

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.16.20

1. Check installed version

apt-cache policy anti.virus || rpm -q anti.virus || anti.virus --version

2. No fixed release: DOWNGRADE to a release before 2.16.20 (Debian / Ubuntu)

apt-cache madison anti.virus sudo apt install anti.virus=<VERSION_BEFORE_2.16.20> sudo apt-mark hold anti.virus

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

dnf --showduplicates list anti.virus sudo dnf downgrade anti.virus-<VERSION_BEFORE_2.16.20> sudo dnf versionlock add anti.virus

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-2017-17804?

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

Is CVE-2017-17804 being exploited?

CVE-2017-17804 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-2017-17804 affect?

CVE-2017-17804 affects anti.virus. Severity is high (CVSS 7.8). In IKARUS anti.virus 2.16.20, the driver file (ntguard.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 0x83000084.

How urgent is CVE-2017-17804?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2017-17797 HIGH 7.8 DOWNGRADE In IKARUS anti.virus 2.16.20, the driver file (ntguard.SYS) allows local users to cause a denial of service (B
CVE-2017-17795 HIGH 7.8 DOWNGRADE In IKARUS anti.virus 2.16.20, the driver file (ntguard.SYS) allows local users to cause a denial of service (B
CVE-2017-17114 HIGH 7.8 DOWNGRADE ntguard.sys and ntguard_x64.sys 0.18780.0.0 in IKARUS anti.virus 2.16.15 have a Memory Corruption vulnerabilit
CVE-2017-17113 MEDIUM 5.5 DOWNGRADE ntguard_x64.sys 0.18780.0.0 in IKARUS anti.virus 2.16.15 has a NULL pointer dereference via a 0x830000c4 Devic
CVE-2017-17112 HIGH 7.8 DOWNGRADE ntguard_x64.sys 0.18780.0.0 in IKARUS anti.virus 2.16.15 has a Pool Corruption vulnerability via a 0x83000058

References

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