CVE-2025-27920: Srimax Output Messenger Directory Traversal Vulnerability

CVE-2025-27920 is a directory traversal vulnerability in Srimax Output Messenger. According to CISA, it allows an attacker to access sensitive files outside the intended directory, potentially leading to configuration leakage or arbitrary file access.

For IT and security teams this matters because readable configuration files, credentials, or other data outside the application’s intended scope can give an attacker a foothold for further movement. Treat the product as a priority for inventory and remediation until the vendor advisory is confirmed and applied.

How it works

The weakness is classified as CWE-22: improper limitation of a pathname to a restricted directory. In this class of flaw, user-supplied path information is not correctly constrained, so an attacker can supply sequences that navigate outside the intended directory tree.

In Srimax Output Messenger the result is the ability to reach files beyond the application’s designed scope. Exact request parameters, endpoints, or traversal sequences are not provided in the public summary; any exploitation details must be confirmed against the vendor advisory rather than assumed.

Am I affected? How to find it in your systems

Srimax Output Messenger is typically found in environments that use the product for messaging or output handling. Begin with a full software inventory rather than relying on network scans alone.

• Search asset-management databases, package inventories, and endpoint management tools for the product name “Srimax Output Messenger.”
• Identify hosts that expose related services or administrative interfaces and note their network placement.
• Compare installed versions and configurations against the ranges and conditions listed in the vendor advisory for CVE-2025-27920; do not rely on version numbers not published by the vendor.
• Review application, web-server, and file-access logs for unusual path requests that attempt to leave the expected directory structure—these are common telemetry signs of directory-traversal probing.

How to remediate

Patch first. Apply the vendor update or the specific mitigations named in the official advisory for CVE-2025-27920. CISA’s required action is to apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

• After applying the update, verify the new version or configuration state and re-test that path traversal is no longer possible.
• Restrict the application’s runtime privileges so that even if a path is traversed the process cannot read sensitive system files.
• Enforce strict input validation and path canonicalization on any remaining file-serving or download features.
• Document the change and retain evidence of the advisory version that was applied.

If you can't patch immediately

Until the vendor fix can be installed, reduce the attack surface with compensating controls that address the directory-traversal class.

• Place the host behind network segmentation so that only trusted management networks can reach the service.
• Deploy virtual-patching rules on a web application firewall or reverse proxy that block common parent-directory sequences; validate the rules against the vendor’s description of the flaw.
• Disable any non-essential file-access, download, or export features if the product configuration permits it.
• Increase monitoring and alerting for anomalous file-read activity outside expected directories and for repeated failed access attempts that suggest traversal probing.

If your data may have been exposed

Actively exploited vulnerabilities can lead to breaches when sensitive files become readable. Ransomware use is not documented for this CVE, yet any successful arbitrary file access still warrants investigation of what was accessible and whether credentials or configuration data were present.

Examine logs for signs of exploitation, rotate any secrets that may have been exposed, and assess whether further lateral movement occurred. Readers can run a free exposure scan of their email address to check whether it appears in known breach data sets.