CVE-2024-8808: Cohesive VNS3 Command Injection RCE Vulnerability

CVE-2024-8808 Overview

CVE-2024-8808 is an authenticated command injection vulnerability in Cohesive Networks VNS3, a cloud network security appliance. The flaw resides in the VNS3 web service that listens on TCP port 8000 by default. The service fails to properly validate a user-supplied string before passing it to a system call. Authenticated remote attackers can leverage this weakness to execute arbitrary commands as root on the underlying host. The issue was reported through the Zero Day Initiative as ZDI-CAN-24177 and tracked publicly as ZDI-24-1232.

Critical Impact
Successful exploitation grants attackers full root-level code execution on VNS3 appliances, compromising confidentiality, integrity, and availability of the network overlay device.

Affected Products

Cohesive Networks VNS3 (versions prior to the vendor's remediated release)
VNS3 web management service exposed on TCP port 8000
Deployments across AWS, Azure, GCP, and private cloud environments

Discovery Timeline

2024-11-22 - CVE-2024-8808 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-8808

Vulnerability Analysis

The vulnerability is classified as OS Command Injection [CWE-78]. The VNS3 web administration interface accepts a parameter that flows into a system call without proper sanitization or escaping. An authenticated attacker submits a crafted request to the web service on TCP port 8000 containing shell metacharacters. The application concatenates the attacker-controlled input into a command string executed by the underlying shell.

Because the VNS3 web service runs with elevated privileges, injected commands execute in the context of root. This yields full control over the appliance, including cryptographic material, routing configuration, and connected overlay networks. The EPSS score of 1.582% (73.65 percentile) indicates measurable exploitation likelihood relative to the broader CVE population.

Root Cause

The root cause is missing input validation on a user-supplied string prior to its use in a shell command. The affected code path constructs an operating system call using unsanitized attacker input rather than using parameterized execution or a strict allowlist of permitted values.

Attack Vector

Exploitation requires network access to the VNS3 web service on TCP port 8000 and valid authenticated credentials. Once authenticated, the attacker issues a crafted HTTP request embedding shell metacharacters such as backticks, semicolons, or command substitution syntax. The service executes the injected payload as root. No user interaction is required beyond the authenticated session.

Refer to the Zero Day Initiative Advisory ZDI-24-1232 for additional technical detail. No public proof-of-concept exploit is currently available.

Detection Methods for CVE-2024-8808

Indicators of Compromise

Unexpected child processes spawned by the VNS3 web service on TCP port 8000, particularly shells such as /bin/sh or /bin/bash.
Outbound network connections from the VNS3 appliance to unfamiliar hosts following administrative HTTP requests.
New or modified files under system paths writable only by root, including cron entries, SSH authorized_keys, or startup scripts.
Anomalous authenticated sessions to the VNS3 management interface from unusual source IPs or at atypical times.

Detection Strategies

Inspect HTTP request bodies and query strings sent to the VNS3 web service for shell metacharacters such as ;, |, &&, `, and $(.
Correlate authentication events on port 8000 with subsequent process execution on the appliance to identify command injection patterns.
Alert on any process lineage where the VNS3 web daemon is the parent of a shell interpreter or network utility such as curl, wget, or nc.

Monitoring Recommendations

Forward VNS3 access logs, authentication logs, and system audit logs to a centralized SIEM for continuous analysis.
Baseline normal administrative activity on port 8000 and flag deviations in request patterns or user agents.
Monitor egress traffic from VNS3 appliances, since exploitation often results in reverse shells or payload retrieval from external infrastructure.

How to Mitigate CVE-2024-8808

Immediate Actions Required

Apply the vendor-supplied patch referenced in the Cohesive Security Responses advisory as soon as it is available for your VNS3 version.
Restrict network access to the VNS3 web service on TCP port 8000 to trusted management networks only, using security groups, firewall rules, or a bastion host.
Rotate all VNS3 administrative credentials and API keys, particularly if appliances were reachable from untrusted networks.
Audit VNS3 hosts for signs of prior exploitation, including unexpected root-owned processes, new users, and modified startup scripts.

Patch Information

Cohesive Networks has published remediation guidance on the Cohesive Security Responses page. Administrators should consult this advisory for the specific fixed VNS3 build and upgrade instructions applicable to their deployment channel.

Workarounds

Place the VNS3 management interface behind a VPN or zero-trust access proxy that enforces additional authentication and source restrictions.
Enforce strong, unique credentials and multi-factor authentication on all VNS3 administrative accounts to reduce the population of viable attackers.
Apply least-privilege principles to any automation or service account that authenticates to the VNS3 web service on port 8000.

bash

# Example: restrict access to VNS3 management port 8000 to a management CIDR
# AWS security group rule (illustrative)
aws ec2 authorize-security-group-ingress \
  --group-id sg-EXAMPLE \
  --protocol tcp \
  --port 8000 \
  --cidr 10.10.0.0/24

# Remove any overly permissive 0.0.0.0/0 rule for port 8000
aws ec2 revoke-security-group-ingress \
  --group-id sg-EXAMPLE \
  --protocol tcp \
  --port 8000 \
  --cidr 0.0.0.0/0