# CVE-2025-8876 — N-able N-central

**CISA KEV**

> As of 2025-10-21, CVE-2025-8876 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in N-able N-central, CVSS v4.0 9.4, EPSS 3.4% (88.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-08-13), with a US federal remediation deadline of 2025-08-20. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2025-8876, most recently “Volt Typhoon 'Silent Train' Relay Framework Used to Conceal Zero-Day Exploitation (CVE-2026-16812, CVE-2026-20127, CVE-2025-8875, CVE-2025-8876, CVE-2024-39717)”.

**Last updated:** 2025-10-21

## What is CVE-2025-8876?

Improper Input Validation vulnerability in N-able N-central allows OS Command Injection.This issue affects N-central: before 2025.3.1.

The record classifies CVE-2025-8876 under weakness class [CWE-20](https://intel.threadlinqs.com/cwe/CWE-20). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 441 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.4 — Critical (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **EPSS (FIRST):** 3.4% probability of exploitation in the next 30 days, higher than 88.6% of all scored CVEs
- **CISA KEV:** Listed since 2025-08-13, federal remediation deadline 2025-08-20
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2025-08-14, last modified 2025-10-21

## Is CVE-2025-8876 being exploited?

CISA added CVE-2025-8876 to the Known Exploited Vulnerabilities catalog on 2025-08-13, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-08-20 under BOD 22-01. Weaponised exploit code for CVE-2025-8876 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2025/CVE-2025-8876.md) (trickest)

## Affected products and versions

- [N-able](https://intel.threadlinqs.com/vendors/n-able): N-central

## How to fix CVE-2025-8876

Because CVE-2025-8876 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-08-20. No vendor patch reference has been recorded for CVE-2025-8876 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2025-8876

2 tracked threats in the Threadlinqs corpus reference CVE-2025-8876, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Volt Typhoon 'Silent Train' Relay Framework Used to Conceal Zero-Day Exploitation (CVE-2026-16812, CVE-2026-20127, CVE-2025-8875, CVE-2025-8876, CVE-2024-39717)](https://intel.threadlinqs.com/threat/TL-2026-4665) — HIGH · 2026-10-28
- [The Remote Access Blind Spot: Acronis TRU Analysis of RMM Tool Proliferation and Abuse Risk in SMB Environments](https://intel.threadlinqs.com/threat/TL-2026-2115) — MEDIUM · 2026-05-13

## Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [status.n-able.com](https://status.n-able.com/2025/08/13/announcing-the-ga-of-n-central-2025-3-1/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2025-8876
Full detection coverage and IOCs for threats exploiting CVE-2025-8876 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp