Ivanti Endpoint Manager Cloud Service Appliance (EPM CSA) contains a code injection vulnerability that allows an unauthenticated user to execute malicious code with limited permissions (nobody).
FREQUENTLY ASKED
What is CVE-2021-44529 and why does it matter?
CVE-2021-44529 is a critical code injection vulnerability (CWE-94) in the Ivanti Endpoint Manager Cloud Service Appliance (EPM CSA). It carries a CVSS score of 9.8 and allows unauthenticated attackers to execute arbitrary code remotely. Because it is actively exploited and has a high EPSS score, it represents a severe risk of data breach and ransomware deployment for organizations using the appliance.
Which versions of the product are affected?
Based on current data, Ivanti Endpoint Manager Cloud Service Appliance version 4.6.0-512 is specifically identified as affected. Organizations using any legacy versions of the CSA should assume they are vulnerable and verify their deployment against the official Ivanti security bulletins to ensure they are running a secure, supported release.
Has a patch been released for CVE-2021-44529?
Yes, Ivanti has released remediation instructions and patches. The official response is detailed in security advisory SA-2021-12-02. Administrators are urged to visit the Ivanti portal to download the necessary updates or follow the mitigation steps provided to close the code injection vector and protect the appliance from unauthenticated exploitation.
What is the remediation deadline and what it means for compliance?
The remediation deadline for CVE-2021-44529 is April 15, 2024. For many organizations, particularly those following CISA mandates or federal compliance standards like BOD 22-01, failing to mitigate this vulnerability by the deadline signifies non-compliance. This deadline emphasizes the urgency due to known ransomware use and active exploitation in the wild.
How can I check if my instance is affected?
To determine if your deployment is affected, verify the version number of your Ivanti Endpoint Manager Cloud Service Appliance. If it matches version 4.6.0-512 or older, it is likely vulnerable. You should also check for any indicators of compromise (IoCs) and cross-reference your patch level with the Ivanti security advisory SA-2021-12-02 to ensure all mitigations are correctly applied.
The Ivanti Endpoint Manager Cloud Service Appliance (EPM CSA) is currently facing a critical security challenge identified as CVE-2021-44529. This vulnerability, classified as a CWE-94: Code Injection, allows an unauthenticated, remote attacker to execute arbitrary code on the appliance. With a CVSS score of 9.8 (CRITICAL), the exploitability and impact potential are at the highest tiers. Security professionals must prioritize remediation immediately, as the official remediation deadline of April 15, 2024, underscores a high-risk window where active exploitation and ransomware activities have been confirmed.
Vulnerability Profile
Field
Details
CVE ID
CVE-2021-44529
Affected Product & Versions
Ivanti EPM CSA version 4.6.0-512
CVSS Score & Severity
9.8 (CRITICAL)
CVSS Version
3.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
CWE IDs
CWE-94 (Code Injection)
Date Disclosed
2024-03-25
Remediation Deadline
2024-04-15
SSVC Exploitation Status
Active
Known Ransomware Use
Yes
EPSS Score & Percentile
0.94461 (100th percentile)
Patch Available
Yes (SA-2021-12-02)
Technical Deep Dive: CWE-94 Code Injection
CVE-2021-44529 centers on CWE-94: Improper Control of Generation of Code ('Code Injection'). In the context of the Ivanti EPM CSA, this vulnerability manifests when the application fails to properly neutralize user-supplied input that is later used to construct executable code.
The Attack Chain
The vulnerability allows an unauthenticated attacker to interact with the appliance over the network. Because the Attack Complexity is LOW and Privileges Required is NONE, the barrier to entry for an attacker is minimal. The attack involves sending a specially crafted request to a vulnerable endpoint on the CSA. This request injects malicious logic into the application's runtime environment, forcing the server to execute the attacker's commands.
While the code execution occurs with the permissions of the nobody user, this "limited" permission set is a deceptive metric. In modern enterprise environments, gaining a foothold as nobody on a gateway appliance like the CSA provides a significant launchpad for lateral movement.
Blast Radius and Surface Area
The EPM CSA acts as a bridge between internal managed endpoints and external networks. This positioning makes it a prime target. A compromise here can lead to:
Credential Harvesting: Monitoring traffic passing through the appliance.
Internal Pivoting: Using the CSA as a proxy to attack internal Ivanti Endpoint Manager core servers.
Data Exfiltration: Accessing configuration files or cached data stored on the appliance.
Comparatively, this vulnerability mirrors other high-profile gateway exploits where the initial access is unauthenticated and results in immediate command execution. The EPSS score of 0.94461 indicates that this is one of the most likely vulnerabilities to be exploited in the wild, sitting in the 100th percentile of threat probability.
Who Is Affected
Organizations utilizing the Ivanti Endpoint Manager Cloud Service Appliance (EPM CSA) on version 4.6.0-512 are at immediate risk. This appliance is commonly used by large enterprises and government agencies to manage remote devices that are not connected to the internal VPN.
Compliance and Mandates
This vulnerability has been flagged under CISA BOD 22-01. For federal agencies and organizations aligned with CISA's Known Exploited Vulnerabilities (KEV) catalog, mitigation is not optional. The remediation deadline of April 15, 2024, is a hard cutoff. Failure to apply the necessary patches by this date leaves the organization in a state of non-compliance and extreme operational risk, given the documented use of this CVE by ransomware operators.
Official Remediation Steps
Ivanti has provided a clear path for remediation. Administrators should follow these steps to secure their environment:
Identify Vulnerable Instances: Audit your network to identify all instances of the Ivanti CSA. Check the version number to confirm if you are running version 4.6.0-512 or earlier.
Access the Security Advisory: Review the official Ivanti Security Advisory SA-2021-12-02 available at Ivanti Forums.
Apply Version Updates: Upgrade the appliance to the latest supported version provided by Ivanti. Ensure that the update process completes successfully and that the version number reflects the patched state.
Validate Mitigation: After patching, use network scanning tools to ensure the vulnerable endpoints are no longer accessible to unauthenticated requests.
Monitor for Compromise: If your appliance was exposed to the internet while unpatched, perform a forensic review of the logs. Look for unusual activity associated with the nobody user or unexpected outbound connections from the CSA.
Security Best Practices
To defend against CWE-94 and similar RCE-class vulnerabilities, organizations should adopt a defense-in-depth strategy:
Strict Egress Filtering: Limit the CSA's ability to initiate outbound connections to the internet. Restrict it to only known, required update servers to prevent command-and-control (C2) callbacks.
Network Segmentation: Place the CSA in a hardened DMZ. Ensure that it has minimal, highly restricted access to the internal network and the EPM Core server.
Implement WAF Rules: Use a Web Application Firewall (WAF) to inspect incoming traffic for common code injection patterns and malicious payloads targeting Ivanti endpoints.
Principle of Least Privilege: Although the exploit runs as nobody, ensure the appliance OS is hardened and that the nobody account has no access to sensitive system binaries or configuration files.
Vulnerability Lifecycle Management: Maintain a rigorous patching schedule. Given the 100% EPSS percentile of CVE-2021-44529, zero-day or high-probability exploits must be addressed within 24–48 hours of discovery.
Continuous Monitoring: Deploy File Integrity Monitoring (FIM) and Endpoint Detection and Response (EDR) on the appliance (where supported) to catch post-exploitation behavior in real-time.