CVE-2026-10520: Ivanti Sentry OS Command Injection — CVSS 10.0

Executive Summary

A maximum-severity OS command injection vulnerability — CVE-2026-10520 — has been disclosed in Ivanti Sentry, Ivanti's mobile security gateway and email proxy platform. Rated CVSS 10.0, this flaw allows a remote, unauthenticated attacker to execute arbitrary commands as root on affected systems. All Sentry deployments running versions earlier than R10.5.2, R10.6.2, or R10.7.1 are vulnerable.

Given Ivanti's history of zero-day exploitation by nation-state actors, this disclosure demands immediate remediation action.

Vulnerability Details

Technical Overview

Ivanti Sentry functions as a security gateway for mobile device management, proxying communications between mobile devices and internal enterprise services including Microsoft Exchange, Lotus Domino, and other ActiveSync providers. The vulnerability exists in the way Sentry processes certain unauthenticated requests, allowing an attacker to inject OS-level commands that execute in a root context.

A successful exploit gives the attacker:

• Full control of the Sentry appliance
• Access to all proxied email and MDM communications transiting through the device
• A foothold in the network segment where Sentry is deployed
• Potential access to credentials and configuration data cached on the appliance

Affected Versions

Remediation

Immediate Priority: Upgrade Ivanti Sentry

Apply the patches immediately. There are no known workarounds that fully mitigate this vulnerability; patching is the only complete remediation.

1. Determine your current version — Log in to the Sentry Management Portal and check Help > About
2. Download the appropriate fixed RPM from the Ivanti Customer Portal
3. Apply the patch following Ivanti's standard upgrade procedure
4. Restart the Sentry service to ensure the patch is active
5. Verify the version post-upgrade to confirm successful application

Post-Patch Investigation

Given the CVSS 10.0 severity and Ivanti's history of active exploitation, organizations should conduct forensic investigation even if no active exploit is confirmed:

# Check for unexpected processes running as root
ps aux | grep -E "^root"
 
# Review recent authentication logs for suspicious activity
grep "FAIL\|ERR\|unauthorized" /var/log/sentry/access.log | tail -100
 
# Look for newly created files in web-accessible directories
find /opt/sentry/webapps -newer /opt/sentry/version.txt -type f
 
# Check for cron job persistence
crontab -l -u root
cat /etc/cron.d/*

Network-Level Mitigations (if patch not immediately possible)

If immediate patching is not possible, restrict exposure as a compensating control:

- Block all external unauthenticated access to the Sentry management interface
- Restrict access to Sentry on port 443 to known, authorized source IP ranges
- Enable IDS/IPS rules to detect command injection patterns in HTTP requests
- Monitor Sentry logs for unusual POST requests or unexpected process spawning

Indicators of Compromise

Organizations should hunt for the following artifacts indicating potential exploitation:

Ivanti Product Targeting: A Recurring Pattern

This is not an isolated incident. Ivanti products have been targeted by advanced threat actors — particularly Chinese state-sponsored groups — in a sustained campaign spanning multiple years:

Organizations relying heavily on Ivanti products should establish a dedicated response process for Ivanti advisories that treats CVSS 9.0+ disclosures as requiring same-day action.

Enterprise Risk Assessment

Who is most exposed?

• Organizations using Ivanti Sentry as their ActiveSync gateway for mobile email access
• Enterprises with Sentry deployed in perimeter network segments reachable from the internet
• Organizations using Sentry to proxy access to Microsoft Exchange, Office 365, or Lotus Domino environments

What is the blast radius of a successful exploit?

A compromised Sentry appliance exposes:

• All mobile email communications for users proxied through the device
• Stored credentials and authentication tokens cached by the proxy
• Adjacent network segments reachable from the Sentry VLAN
• Potential pivot point into Active Directory environments

References

• NVD: CVE-2026-10520
• Ivanti Security Advisory Portal
• CISA Known Exploited Vulnerabilities Catalog
• Prior Coverage: Ivanti EPMM Zero-Days CVE-2026-1281/1340