CVE-2018-8873: In 2345 Security Guard 3.6, the driver file (2345NetFirewall.sys) allows local users to cause a denial of serv

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HIGH 7.8DOWNGRADE

CVE-2018-8873 is a high-severity flaw (CVSS 7.8) affecting 2345 security guard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In 2345 Security Guard 3.6, the driver file (2345NetFirewall.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 0x00222040.

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 64%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-03-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: 2345 security guard project

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

Am I affected?

Timeline

2018-03-20 22:29 UTCPublished CVE record published
2026-06-17 02:05 UTCUpdated Record last modified

2345 security guard project 2345 security guard DOWNGRADE

Affected: 3.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6

1. Check installed version

apt-cache policy 2345-security-guard || rpm -q 2345-security-guard || 2345-security-guard --version

2. No fixed release: DOWNGRADE to a release before 3.6 (Debian / Ubuntu)

apt-cache madison 2345-security-guard sudo apt install 2345-security-guard=<VERSION_BEFORE_3.6> sudo apt-mark hold 2345-security-guard

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

dnf --showduplicates list 2345-security-guard sudo dnf downgrade 2345-security-guard-<VERSION_BEFORE_3.6> sudo dnf versionlock add 2345-security-guard

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-2018-8873?

2345 security guard: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-8873 being exploited?

CVE-2018-8873 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-2018-8873 affect?

CVE-2018-8873 affects 2345 security guard. Severity is high (CVSS 7.8). In 2345 Security Guard 3.6, the driver file (2345NetFirewall.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 0x00222040.

How urgent is CVE-2018-8873?

Priority 41/100. High severity; Public exploit reference

Related CVEs

CVE-2018-8896 HIGH 7.8 DOWNGRADE In 2345 Security Guard 3.6, the driver file (2345DumpBlock.sys) allows local users to cause a denial of servic
CVE-2018-8895 HIGH 7.8 DOWNGRADE In 2345 Security Guard 3.6, the driver file (2345DumpBlock.sys) allows local users to cause a denial of servic
CVE-2018-8894 HIGH 7.8 DOWNGRADE In 2345 Security Guard 3.6, the driver file (2345BdPcSafe.sys) allows local users to cause a denial of service
CVE-2018-8876 HIGH 7.8 DOWNGRADE In 2345 Security Guard 3.6, the driver file (2345Wrath.sys) allows local users to cause a denial of service (B
CVE-2018-8875 HIGH 7.8 DOWNGRADE In 2345 Security Guard 3.6, the driver file (2345Wrath.sys) allows local users to cause a denial of service (B

References

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