CVE-2019-19820: An invalid pointer vulnerability in IOCTL Handling in the kyrld.sys driver in Kyrol Internet Security 9.0.6.9

This month

HIGH 7.8DOWNGRADE

CVE-2019-19820 is a high-severity flaw (CVSS 7.8) affecting internet security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An invalid pointer vulnerability in IOCTL Handling in the kyrld.sys driver in Kyrol Internet Security 9.0.6.9 allows an attacker to achieve privilege escalation, denial-of-service, and code execution via usermode because 0x9C402405 using METHOD_NEITHER results in a read primitive.

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	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-763
Published	2020-01-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kyrol

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

Am I affected?

Timeline

2020-01-10 17:15 UTCPublished CVE record published
2026-06-17 02:27 UTCUpdated Record last modified

kyrol internet security DOWNGRADE

Affected: 9.0.6.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0.6.9

1. Check installed version

apt-cache policy internet-security || rpm -q internet-security || internet-security --version

2. No fixed release: DOWNGRADE to a release before 9.0.6.9 (Debian / Ubuntu)

apt-cache madison internet-security sudo apt install internet-security=<VERSION_BEFORE_9.0.6.9> sudo apt-mark hold internet-security

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

dnf --showduplicates list internet-security sudo dnf downgrade internet-security-<VERSION_BEFORE_9.0.6.9> sudo dnf versionlock add internet-security

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-2019-19820?

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

Is CVE-2019-19820 being exploited?

CVE-2019-19820 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-2019-19820 affect?

CVE-2019-19820 affects internet security. Severity is high (CVSS 7.8). An invalid pointer vulnerability in IOCTL Handling in the kyrld.sys driver in Kyrol Internet Security 9.0.6.9 allows an attacker to achieve privilege escalation, denial-of-service, and code execution via usermode because 0x9C402405 using ME

How urgent is CVE-2019-19820?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2025-7073 HIGH 7.8 UPGRADE UPGRADE A local privilege escalation vulnerability in Bitdefender Total Security versions prior to 27.0.47.241 allows
CVE-2026-6851 HIGH 7.0 UPGRADE UPGRADE An Improper link resolution before file access ('link following') vulnerability in the File Shredder module as
CVE-2026-27750 HIGH 7.8 UPGRADE Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component
CVE-2026-27749 HIGH 7.8 UPGRADE Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup compo
CVE-2026-27748 HIGH 7.8 UPGRADE Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component

References

← Back to latest CVEs