CVE-2018-5701: In Iolo System Shield AntiVirus and AntiSpyware 5.0.0.136, the amp.sys driver file contains an Arbitrary Write

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-5701 is a critical-severity flaw (CVSS 9.8) affecting system shield. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Iolo System Shield AntiVirus and AntiSpyware 5.0.0.136, the amp.sys driver file contains an Arbitrary Write vulnerability due to not validating input values from IOCtl 0x00226003.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	18.5% (top 3%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-01-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: iolo

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

Am I affected?

Timeline

2018-01-31 18:29 UTCPublished CVE record published
2026-06-17 02:00 UTCUpdated Record last modified

iolo system shield DOWNGRADE

Affected: 5.0.0.136

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.0.136

1. Check installed version

apt-cache policy system-shield || rpm -q system-shield || system-shield --version

2. No fixed release: DOWNGRADE to a release before 5.0.0.136 (Debian / Ubuntu)

apt-cache madison system-shield sudo apt install system-shield=<VERSION_BEFORE_5.0.0.136> sudo apt-mark hold system-shield

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

dnf --showduplicates list system-shield sudo dnf downgrade system-shield-<VERSION_BEFORE_5.0.0.136> sudo dnf versionlock add system-shield

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: System Mechanic v15.5.0.61 - Arbitrary Read/Write
Exploit-DB: System Shield 5.0.0.136 - Privilege Escalation

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-2018-5701?

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

Is CVE-2018-5701 being exploited?

CVE-2018-5701 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-2018-5701 affect?

CVE-2018-5701 affects system shield. Severity is critical (CVSS 9.8). In Iolo System Shield AntiVirus and AntiSpyware 5.0.0.136, the amp.sys driver file contains an Arbitrary Write vulnerability due to not validating input values from IOCtl 0x00226003.

How urgent is CVE-2018-5701?

Priority 69/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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