CVE-2025-34277: 
Nagios Log Server vulnerability analysis and mitigation

CVE-2025-34277 is a code injection vulnerability (CWE-94) in Nagios Log Server that allows remote attackers to execute arbitrary code by supplying malformed dashboard ID values. Affected versions include all Nagios Log Server releases prior to 2024R1.3.1, including 2024R1, 2024R1.0.1, 2024R1.0.2, 2024R1.1, 2024R1.2, and 2024R1.3. The vulnerability was published on October 30, 2025, and assigned by VulnCheck. It carries a CVSS v3.1 base score of 9.8 (Critical) and a CVSS v4.0 base score of 9.4 (Critical) (VulnCheck Advisory, Red Hat CVE).

The root cause is improper input validation (CWE-94: Improper Control of Generation of Code) of dashboard ID values supplied by users. These malformed values are not sanitized before being forwarded to an internal API, allowing attacker-controlled data to be interpreted and executed as code within the Log Server process. The attack vector is network-accessible, requires no user interaction, and — per the CVSS v3.1 scoring — requires no privileges, though the CVSS v4.0 scoring notes low privileges required. No public proof-of-concept code has been identified at this time (VulnCheck Advisory, Red Hat CVE).

Successful exploitation allows an attacker to execute arbitrary code in the context of the Nagios Log Server process, resulting in high impact to confidentiality, integrity, and availability. An attacker could gain unauthorized access to sensitive log data, manipulate or destroy log records, disrupt monitoring operations, and potentially pivot to other systems accessible from the Log Server host. The CVSS v4.0 scoring also reflects high impact on subsequent (downstream) systems, indicating significant lateral movement potential (VulnCheck Advisory).

There is currently no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of publication (VulnCheck Advisory). The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.07%, reflecting a currently low probability of exploitation in the near term. No threat actor attribution has been reported.

The primary remediation is to upgrade Nagios Log Server to version 2024R1.3.1 or later, which addresses the improper validation of dashboard ID values (Nagios Security, Nagios Changelog). As interim mitigations, administrators should restrict network access to the Log Server using firewall rules or network segmentation, apply the principle of least privilege to Log Server accounts, and monitor logs for anomalous or unexpected dashboard ID values in API requests.

The vulnerability received standard automated coverage across CVE tracking platforms and security feeds shortly after publication. No notable researcher commentary, vendor statements beyond the changelog, or significant social media discussion has been identified beyond routine CVE broadcast posts (Red Hat CVE).