Is CVE-2018-11138 in the CISA KEV catalog?

Yes. CVE-2018-11138 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25, and has known ransomware campaign use.

What is the CVSS severity of CVE-2018-11138?

CVE-2018-11138 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-11138?

CVE-2018-11138 has an EPSS score of 91.93% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2018-11138?

No published fix for CVE-2018-11138 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-04-15. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2018-11138

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

The '/common/download_agent_installer.php' script in the Quest KACE System Management Appliance 8.0.318 is accessible by anonymous users and can be abused to execute arbitrary commands on the system.

CWE-78OS Command Injection

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-04-15

Known ransomware campaign use

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

91.93%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Quest KACE System Management Appliance Remote Command Execution Vulnerability

The '/common/download_agent_installer.php' script in the Quest KACE System Management Appliance is accessible by anonymous users and can be abused to perform remote code execution.

Apply updates per vendor instructions.

Remediation due: 2022-04-15

Associated with ransomware campaigns

References

Exploit2

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-05.