How severe is CVE-2016-9565?

CVE-2016-9565 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-2016-9565 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-9565?

CVE-2016-9565 affects Nagios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-9565?

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-2016-9565 published?

CVE-2016-9565 was published on 2016-12-15 and last updated on 2026-06-17.

CVE-2016-9565

CVE-2016-9565 is a critical-severity vulnerability in Nagios with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 23% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 23% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Nagios
Published: 2016-12-15
Last modified: 2026-06-17

Description

MagpieRSS, as used in the front-end component in Nagios Core before 4.2.2 might allow remote attackers to read or write to arbitrary files by spoofing a crafted response from the Nagios RSS feed server. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4796.

Frequently asked questions

What is CVE-2016-9565?: MagpieRSS, as used in the front-end component in Nagios Core before 4.2.2 might allow remote attackers to read or write to arbitrary files by spoofing a crafted response from the Nagios RSS feed server. NOTE: this vulnerability exists because of an incomplete fix for CVE-2008-4796.
How severe is CVE-2016-9565?: CVE-2016-9565 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-2016-9565 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-9565?: CVE-2016-9565 affects Nagios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-9565?: 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-2016-9565 published?: CVE-2016-9565 was published on 2016-12-15 and last updated on 2026-06-17.

References

Affected products (1)

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

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