How severe is CVE-2025-34277?

CVE-2025-34277 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-2025-34277 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34277?

CVE-2025-34277 primarily affects Nagios Log Server. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-34277?

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.

Does CVE-2025-34277 have an EU (EUVD) identifier?

Yes. CVE-2025-34277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37218.

When was CVE-2025-34277 published?

CVE-2025-34277 was published on 2025-10-30 and last updated on 2026-06-17.

CVE-2025-34277

CVE-2025-34277 is a critical-severity vulnerability in Nagios Log Server 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.4
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37218
Weakness: CWE-94
Affected product: Nagios Log Server
Published: 2025-10-30
Last modified: 2026-06-17

Description

Nagios Log Server versions prior to 2024R1.3.1 contain a code injection vulnerability where malformed dashboard ID values are not properly validated before being forwarded to an internal API. An attacker able to supply crafted dashboard ID values can cause the system to execute attacker-controlled data, leading to arbitrary code execution in the context of the Log Server process.

Frequently asked questions

What is CVE-2025-34277?: Nagios Log Server versions prior to 2024R1.3.1 contain a code injection vulnerability where malformed dashboard ID values are not properly validated before being forwarded to an internal API. An attacker able to supply crafted dashboard ID values can cause the system to execute attacker-controlled data, leading to arbitrary code execution in the context of the Log Server process.
How severe is CVE-2025-34277?: CVE-2025-34277 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-2025-34277 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34277?: CVE-2025-34277 primarily affects Nagios Log Server. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-34277?: 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.
Does CVE-2025-34277 have an EU (EUVD) identifier?: Yes. CVE-2025-34277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37218.
When was CVE-2025-34277 published?: CVE-2025-34277 was published on 2025-10-30 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:a:nagios:log_server:*:*:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1.0.1:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1.0.2:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1.1:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1.2:*:*:*:*:*:*
cpe:2.3:a:nagios:log_server:2024:r1.3:*:*:*:*:*:*

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