CVE-2018-0539: QQQ SYSTEMS version 2.24 allows an attacker to execute arbitrary commands via unspecified vectors.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-0539 is a critical-severity flaw (CVSS 9.8) affecting qqq systems. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

QQQ SYSTEMS version 2.24 allows an attacker to execute arbitrary commands via unspecified vectors.

Why this priority

Critical severity
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	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-78
Published	2018-03-22
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: qqq systems project

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

Am I affected?

Timeline

2018-03-22 13:29 UTCPublished CVE record published
2026-06-17 01:31 UTCUpdated Record last modified

qqq systems project qqq systems DOWNGRADE

Affected: 2.24

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.24

1. Check installed version

apt-cache policy qqq-systems || rpm -q qqq-systems || qqq-systems --version

2. No fixed release: DOWNGRADE to a release before 2.24 (Debian / Ubuntu)

apt-cache madison qqq-systems sudo apt install qqq-systems=<VERSION_BEFORE_2.24> sudo apt-mark hold qqq-systems

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

dnf --showduplicates list qqq-systems sudo dnf downgrade qqq-systems-<VERSION_BEFORE_2.24> sudo dnf versionlock add qqq-systems

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-2018-0539?

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

Is CVE-2018-0539 being exploited?

CVE-2018-0539 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-2018-0539 affect?

CVE-2018-0539 affects qqq systems. Severity is critical (CVSS 9.8). QQQ SYSTEMS version 2.24 allows an attacker to execute arbitrary commands via unspecified vectors.

How urgent is CVE-2018-0539?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-0538 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or
CVE-2018-0537 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or
CVE-2018-0536 MEDIUM 6.1 DOWNGRADE Cross-site scripting vulnerability in QQQ SYSTEMS ver2.24 allows an attacker to inject arbitrary web script or

References

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