CVE-2025-69260: 
Apex Central vulnerability analysis and mitigation

CVE-2025-69260 is a message out-of-bounds read vulnerability in Trend Micro Apex Central (on-premise) that allows an unauthenticated remote attacker to trigger a denial-of-service (DoS) condition. It affects Apex Central 2019 versions prior to Build 7190 running on Windows. The vulnerability was discovered by Tenable and disclosed to Trend Micro on August 26, 2025, with coordinated public disclosure on January 7–8, 2026. It carries a CVSS v3.1 base score of 7.5 (High), assigned by Trend Micro (Trend Micro Advisory, Tenable Research).

The vulnerability resides in MsgReceiver.exe, which listens on TCP port 20001 and processes structured messages. Specifically, message type 0x1b5b (without the "new protocol" indicator) contains a series of x_astring fields (a length-prefixed string structure). The CIPCMsgBuffer_GetStringPtr function in msgHandlerLogReceiver.dll advances an internal buffer cursor by the attacker-specified x_astring.size without validating that the new position remains within the buffer bounds. When a subsequent x_astring is processed, the cursor points to an invalid memory location, causing an access violation and crashing the process (Tenable Research). The root cause is classified as CWE-125 (Out-of-bounds Read), with additional CWE-120 (Buffer Copy without Checking Size of Input) and CWE-346 (Origin Validation Error) assigned by the vendor. No authentication is required to send the malicious message to the exposed TCP port (Trend Micro Advisory).

Successful exploitation causes MsgReceiver.exe to crash due to an invalid memory access, resulting in a denial-of-service condition that disrupts Apex Central's availability. Since Apex Central is a centralized security management console, its unavailability can impair visibility and policy enforcement across all managed endpoints in an organization. There is no confidentiality or integrity impact — the CVSS score reflects a High availability impact only, with no data exposure or unauthorized modification risk (Trend Micro Advisory, Tenable Research).

A proof-of-concept (PoC) exploit script (tm_apex_central_MsgReceiver_msg_1b5b_oob_read_dos.py) was published by Tenable as part of their research advisory TRA-2026-01 (Tenable Research). As of the time of disclosure, there is no evidence of active in-the-wild exploitation. The EPSS score is approximately 0.087%, indicating a low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Detection is available via Nessus plugin ID 282525 (Feedly).

1. Reconnaissance: Identify internet-facing or network-accessible Trend Micro Apex Central (on-premise) installations running on Windows with versions prior to Build 7190. Use network scanning tools to locate hosts with TCP port 20001 open, which is the default port for MsgReceiver.exe.
2. Craft malicious message: Construct a message of type 0x1b5b (without the "new protocol" two-byte zero indicator) targeting the MsgReceiver.exe listener. The message structure includes a header (hdr) followed by the MsgId (0x1b5b) and a series of x_astring fields (SrcType, SrcIDr, XMLData).
3. Set oversized string length: In the first x_astring field, set the size field to a very large value (e.g., 0xc7551000) that exceeds the actual buffer size. The CIPCMsgBuffer_GetStringPtr function will advance the internal buffer cursor past the end of the allocated buffer without bounds checking.
4. Trigger out-of-bounds read: When the second x_astring is processed, the buffer cursor points to an invalid memory address. The subsequent read operation causes an access violation, crashing MsgReceiver.exe and rendering Apex Central unavailable.
5. Confirm DoS: The connection is reset by the peer after the crash. Subsequent connection attempts to port 20001 will be refused, confirming the service is down (Tenable Research).

• Network: Unexpected or repeated TCP connection attempts to port 20001 on Apex Central servers from external or untrusted IP addresses; connection resets immediately following message delivery to port 20001.
• Process: MsgReceiver.exe process crash or absence from the running process list; Windows Error Reporting (WER) crash dumps generated for MsgReceiver.exe.
• Logs: Windows Application Event Log entries indicating an unhandled exception or access violation in MsgReceiver.exe or msgHandlerLogReceiver.dll; Apex Central service unavailability alerts in management console logs.
• File System: Crash dump files (.dmp) in the Windows error reporting directory associated with MsgReceiver.exe (Tenable Research).

Trend Micro has released Critical Patch Build 7190 for Apex Central 2019 (on-premise), which resolves CVE-2025-69260 along with related vulnerabilities CVE-2025-69258 and CVE-2025-69259. All installations running versions prior to Build 7190 should be updated immediately. As a network-level workaround, restrict access to TCP port 20001 on Apex Central servers to trusted internal networks only, preventing unauthenticated external attackers from reaching the vulnerable MsgReceiver.exe service (Trend Micro Advisory).

The disclosure attracted notable attention due to the broader context of CVE-2025-69258 (a critical 9.8 CVSS RCE vulnerability disclosed simultaneously), which overshadowed CVE-2025-69260 in media coverage. Heise reported that Trend Micro took over four months to respond to Tenable's initial disclosure, highlighting coordination challenges (Heise). The Hacker News, Security Affairs, and multiple security blogs covered the Apex Central vulnerability cluster, emphasizing the unauthenticated nature of the flaws and the availability of public PoC code (The Hacker News, Security Affairs). Community discussion on Mastodon and Bluesky noted the risk of exposing security management infrastructure to the internet.