How severe is CVE-2020-28906?

CVE-2020-28906 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28906 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28906?

CVE-2020-28906 primarily affects Nagios Fusion. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28906?

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

When was CVE-2020-28906 published?

CVE-2020-28906 was published on 2021-05-24 and last updated on 2026-06-17.

CVE-2020-28906

CVE-2020-28906 is a high-severity vulnerability in Nagios Fusion with a CVSS 3.x base score of 8.8. 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-276.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Nagios Fusion
Published: 2021-05-24
Last modified: 2026-06-17

Description

Incorrect File Permissions in Nagios XI 5.7.5 and earlier and Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root. Low-privileged users are able to modify files that are included (aka sourced) by scripts executed by root.

Frequently asked questions

What is CVE-2020-28906?: Incorrect File Permissions in Nagios XI 5.7.5 and earlier and Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation to root. Low-privileged users are able to modify files that are included (aka sourced) by scripts executed by root.
How severe is CVE-2020-28906?: CVE-2020-28906 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28906 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28906?: CVE-2020-28906 primarily affects Nagios Fusion. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-28906?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-28906 published?: CVE-2020-28906 was published on 2021-05-24 and last updated on 2026-06-17.

References

Affected products (2)

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

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-2020-28901 — Critical (CVSS 9.8): Command Injection in Nagios Fusion 4.1.8 and earlier allows for Privilege Escalation or Code Execution as root via…
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…

All CVEs affecting Nagios Fusion →

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