CVE-2025-8876
N-able N-Central Command Injection Vulnerability
Description
CVE-2025-8876 is a high-severity OS command injection vulnerability in N-able N-Central, a widely deployed remote monitoring and management (RMM) platform. The flaw stems from improper input validation that allows an authenticated attacker with low privileges to inject and execute arbitrary operating system commands on the N-Central server. With a CVSS v3.1 score of 8.8 and network-based exploitability, this vulnerability poses a significant risk to managed service providers and their clients. CISA has added CVE-2025-8876 to the Known Exploited Vulnerabilities catalog with a remediation deadline of August 20, 2025, and the EPSS score of 7.85% at the 91st percentile confirms a high probability of exploitation in the wild.
KEV Information
CVSS Score
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HOpen in CalculatorCWEs
Affected Products
| Vendor | Product | Version |
|---|---|---|
| n-able | n-central | < 2025.3.1 |
References
Weakness Type
CWE-20: Improper Input Validation
CVE-2025-8876 is classified under CWE-20 (Improper Input Validation), a fundamental weakness where the application fails to validate user-supplied input against expected formats, lengths, and types. In N-able N-Central, certain input fields in the management interface accept data that is passed to system commands without proper sanitization, enabling injection of malicious command syntax.
Learn more: CWE-20 — Improper Input Validation
CWE-78: OS Command Injection
This vulnerability also maps to CWE-78 (OS Command Injection), which occurs when an application constructs operating system commands using user input without neutralizing shell metacharacters. In N-Central, the improper input validation directly enables injection of OS commands that execute with the privileges of the application process.
Learn more: CWE-78 — OS Command Injection
Impact Analysis
CVE-2025-8876 carries severe implications across all dimensions of the CIA triad. The vulnerability is remotely exploitable over the network (AV:N) with low attack complexity (AC:L), requiring only low-level authentication (PR:L) and no user interaction (UI:N). Confidentiality (High): a successful exploit allows the attacker to read any data accessible to the N-Central server process, potentially including credentials for managed endpoints, configuration data, API keys, and client information stored across the RMM platform. Integrity (High): the attacker can modify server configurations, deploy malicious scripts to managed devices, alter monitoring rules, or inject persistent backdoors into the management infrastructure. Availability (High): command execution can disrupt the N-Central service itself, disable monitoring for all managed clients, or consume server resources to cause denial of service. Given that N-Central manages thousands of endpoints for MSPs, compromising the server provides a devastating pivot point for supply chain attacks against all downstream clients.
Exploit Maturity
CVE-2025-8876 has been confirmed as actively exploited in the wild through its inclusion in CISA's Known Exploited Vulnerabilities catalog, with an expedited remediation deadline of just seven days (August 20, 2025). The EPSS score of 7.85% at the 91st percentile places this vulnerability among the top 9% most likely to be exploited, reflecting significant attacker interest. RMM platforms like N-Central are prime targets for threat actors because compromising a single management server provides access to thousands of managed endpoints, making them ideal for ransomware distribution and supply chain attacks. Although CISA classifies the ransomware association as unknown for this CVE, the attack profile closely matches campaigns that have historically leveraged RMM tools for mass deployment of ransomware and data exfiltration.
Remediation
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Upgrade N-Central immediately to version 2025.3.1 or later, which addresses the improper input validation that enables command injection. The release announcement at N-Central 2025.3.1 GA provides upgrade guidance and release notes.
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Restrict network access to the N-Central management interface by implementing firewall rules and IP allowlists. Ensure the management console is not exposed to the public internet and is accessible only from trusted administrator networks.
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Audit user accounts and privileges within N-Central. Remove unnecessary accounts, enforce multi-factor authentication for all administrative access, and apply the principle of least privilege to limit which users can access functionality that interacts with the underlying operating system.
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Review server logs for indicators of compromise including unusual command executions, unexpected process creation, unauthorized configuration changes, or anomalous network connections originating from the N-Central server. Check for evidence of lateral movement to managed endpoints.
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Implement network segmentation to isolate the N-Central server from critical infrastructure. Deploy endpoint detection and response (EDR) on the server to detect post-exploitation activity, and consider implementing application-level input validation through a web application firewall (WAF) as an additional layer of defense.
Technical Details
CVE-2025-8876 is an OS command injection vulnerability in N-able N-Central caused by improper input validation. The CVSS v3.1 vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H indicates the attack is network-accessible with low complexity, requires only low-level authentication, and impacts all three CIA dimensions at the highest level. The root cause lies in the application's failure to validate and sanitize user-supplied input before incorporating it into operating system commands. An authenticated user with minimal privileges can submit crafted input containing shell metacharacters such as semicolons, pipes, backticks, or command substitution sequences that break out of the intended command context and execute attacker-controlled commands on the underlying server. The dual classification under CWE-20 (Improper Input Validation) and CWE-78 (OS Command Injection) reflects the chain where missing input validation is the enabler and command injection is the resulting exploit technique. N-Central versions prior to 2025.3.1 are affected, and the fix implements proper input sanitization and parameterized command execution.
Frequently Asked Questions
Is CVE-2025-8876 being actively exploited?
Yes. CISA has confirmed active exploitation of CVE-2025-8876 and added it to the Known Exploited Vulnerabilities catalog with an expedited remediation deadline of August 20, 2025. The EPSS score of 7.85% at the 91st percentile further indicates significant exploitation activity.
What products are affected by CVE-2025-8876?
N-able N-Central versions prior to 2025.3.1 are affected by this vulnerability. Organizations running any earlier version of N-Central should upgrade immediately to the patched release.
How do I fix CVE-2025-8876?
Upgrade N-able N-Central to version 2025.3.1 or later. Additionally, restrict network access to the management interface, enforce multi-factor authentication, and audit user privileges to minimize the attack surface.
How severe is CVE-2025-8876?
CVE-2025-8876 has a CVSS v3.1 base score of 8.8 (High severity). The vulnerability allows remote command execution with low privileges and no user interaction, making it highly exploitable. Its presence in the KEV catalog and the 91st EPSS percentile confirm this is a critical-priority vulnerability.
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