CVE-2025-8876
CVE-2025-8876 is a security flaw in N-able N-Central, remote-support software IT providers use to manage their customers’ computers. Attackers can run commands on N-able N-Central. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 13 Aug 2025.[1]
N-able N-Central is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fixed in version 2025.3.1 of N-central.
Description
CISA calls it a command injection in N-able N-Central. In its words: “N-able N-Central contains a command injection vulnerability via improper sanitization of user input.”[1]
The underlying weakness is improper input validation (CWE-20), OS command injection (CWE-78), in MITRE’s list of common software weaknesses.[2]
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists one fixed version: everything before it is affected.[2]
| Product | Fixed in |
|---|---|
| N-central | 2025.3.1 |
Most families won’t have N-able N-Central; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 13 Aug 2025. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 20 Aug 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 4%. That’s in the top 10% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
N-able has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.N-able N-Central is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed (fixed in version 2025.3.1 of N-central), or not in use. CISA gave US government agencies until 20 Aug 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 4%.[4] |
See also
Other N-able N-Central flaws
- CVE-2025-8875: insecure deserialization ·
Other N-able flaws
- CVE-2026-86218, N-able N-central: static code injection ·
- CVE-2026-18556, N-able N-central: authentication bypass using an alternate path or channel ·
- CVE-2026-18577, N-able N-central: authentication bypass using an alternate path or channel ·
Other improper input validation flaws
- CVE-2026-93952, Arista VeloCloud Orchestrator: improper input validation ·
- CVE-2019-1068, Microsoft SQL Server: remote code execution ·
- CVE-2026-12569, PTC Windchill and FlexPLM: improper input validation ·
- CVE-2026-34910, Ubiquiti UniFi OS: improper input validation ·
- CVE-2026-6973, Ivanti Endpoint Manager Mobile (EPMM): improper input validation ·
Added the same day
- CVE-2025-8875, N-able N-Central: insecure deserialization ·
Every N-able flaw on CISA’s list · Everything added in August 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “N-able N-Central Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 13 Aug 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-8876 Detail”. National Vulnerability Database, published 14 Aug 2025.
- ^ N-able. Advisories and fixes: status.n-able.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.041, percentile 90.8, 31 Oct 2026.
- CVE Program. “CVE-2025-8876”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.