---
title: "CVE-2025-27920: Srimax Output Messenger Directory Traversal Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-27920/
description: "CVE-2025-27920 (Srimax Output Messenger): Exploited in the wild (CISA KEV). Output Messenger before 2.0.63 was vulnerable to a directory traversal attack…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-05-05
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-27920"
kev: true
cvss: 7.2
epss: 0.01865
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Srimax Output Messenger. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-05-19, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-06-09 ; treat that as the outer limit, not the target.
- EPSS 1.9% , percentile 79: FIRST’s model estimates a 1.9% chance of exploitation activity in the next 30 days, higher than 79% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

Output Messenger before 2.0.63 was vulnerable to a directory traversal attack through improper file path handling. By using ../ sequences in parameters, attackers could access sensitive files outside the intended directory, potentially leading to configuration leakage or arbitrary file access.

## Affected products (CVE record)

- Srimax Output Messenger: < 2.0.63

## Severity

- mitre CVSS 3.1: 7.2 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`

## Exploitation

- CISA KEV: added 2025-05-19; federal due date 2025-06-09. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 1.86% probability of exploitation activity in the next 30 days; percentile 79.

## Sources

- [Listed in CISA KEV notes (outputmessenger.com)](https://www.outputmessenger.com/cve-2025-27920/)
- [CVE.org record CVE-2025-27920](https://www.cve.org/CVERecord?id=CVE-2025-27920)
- [NVD entry CVE-2025-27920](https://nvd.nist.gov/vuln/detail/CVE-2025-27920)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27920)
- [srimax.com](https://www.srimax.com/products-2/output-messenger/)
- [microsoft.com](https://www.microsoft.com/en-us/security/blog/2025/05/12/marbled-dust-leverages-zero-day-in-output-messenger-for-regional-espionage/)

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Source page: https://erroneo.us/security/cve/CVE-2025-27920/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt