How severe is CVE-2021-47700?

CVE-2021-47700 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-47700 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-47700?

CVE-2021-47700 affects Nagios Nagios Xi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-47700?

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.

Does CVE-2021-47700 have an EU (EUVD) identifier?

Yes. CVE-2021-47700 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34705.

When was CVE-2021-47700 published?

CVE-2021-47700 was published on 2025-10-30 and last updated on 2026-06-17.

CVE-2021-47700

CVE-2021-47700 is a high-severity vulnerability in Nagios Nagios Xi with a CVSS 3.x base score of 7.8. 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-250.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.5
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-34705
Weakness: CWE-250
Affected product: Nagios Nagios Xi
Published: 2025-10-30
Last modified: 2026-06-17

Description

Nagios XI versions prior to 5.8.7 used a temporary directory for Highcharts exports with overly permissive ownership/permissions under the Apache user. Local or co-hosted processes could read/overwrite export artifacts or manipulate paths, risking disclosure or tampering and potential code execution depending on deployment.

Frequently asked questions

What is CVE-2021-47700?: Nagios XI versions prior to 5.8.7 used a temporary directory for Highcharts exports with overly permissive ownership/permissions under the Apache user. Local or co-hosted processes could read/overwrite export artifacts or manipulate paths, risking disclosure or tampering and potential code execution depending on deployment.
How severe is CVE-2021-47700?: CVE-2021-47700 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-47700 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-47700?: CVE-2021-47700 affects Nagios Nagios Xi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-47700?: 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.
Does CVE-2021-47700 have an EU (EUVD) identifier?: Yes. CVE-2021-47700 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34705.
When was CVE-2021-47700 published?: CVE-2021-47700 was published on 2025-10-30 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Nagios Nagios Xi

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