How severe is CVE-2020-28901?

CVE-2020-28901 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28901?

CVE-2020-28901 affects Nagios Fusion. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28901?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-28901 published?

CVE-2020-28901 was published on 2021-05-24 and last updated on 2026-06-17.

CVE-2020-28901

CVE-2020-28901 is a critical-severity vulnerability in Nagios Fusion with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Nagios Fusion
Published: 2021-05-24
Last modified: 2026-06-17

Description

Command Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation or Code Execution as root via vectors related to corrupt component installation in cmd_subsys.php.

Frequently asked questions

What is CVE-2020-28901?: Command Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation or Code Execution as root via vectors related to corrupt component installation in cmd_subsys.php.
How severe is CVE-2020-28901?: CVE-2020-28901 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28901?: CVE-2020-28901 affects Nagios Fusion. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-28901 published?: CVE-2020-28901 was published on 2021-05-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nagios:fusion:*:*:*:*:*:*:*:*

More vulnerabilities in Nagios Fusion

CVE-2020-28908 — Critical (CVSS 9.8): Command Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to nagios.
CVE-2020-28907 — Critical (CVSS 9.8): Incorrect SSL certificate validation in Nagios Fusion 4.1.8 and earlier allows for Escalation of Privileges or Code…
CVE-2020-28904 — Critical (CVSS 9.8): Execution with Unnecessary Privileges in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation as nagios via…
CVE-2020-28902 — Critical (CVSS 9.8): Command Injection in Nagios Fusion 4.1.8 and earlier allows Privilege Escalation from apache to root in cmd_subsys.php.
CVE-2020-28900 — Critical (CVSS 9.8): Insufficient Verification of Data Authenticity in Nagios Fusion 4.1.8 and earlier and Nagios XI 5.7.5 and earlier…
CVE-2020-28909 — High (CVSS 8.8): Incorrect File Permissions in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root via modification…

All CVEs affecting Nagios Fusion →

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