CVE-2025-27920
CVE-2025-27920 is a security flaw in Srimax Output Messenger. Attackers can read files on Srimax Output Messenger that should be out of reach. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 19 May 2025.[1]
Srimax Output Messenger is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fixed in version 2.0.63 of Output Messenger.
Description
CISA calls it a directory traversal in Srimax Output Messenger. In its words: “Srimax Output Messenger contains a directory traversal vulnerability that allows an attacker to access sensitive files outside the intended directory, potentially leading to configuration leakage or arbitrary file access.”[1]
The CVE record adds: “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.”[2]
The underlying weakness is path traversal (CWE-22), in MITRE’s list of common software weaknesses.
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record lists one fixed version: everything before it is affected.[2]
| Product | Fixed in |
|---|---|
| Output Messenger | 2.0.63 |
Most families won’t have Srimax Output Messenger; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 19 May 2025, 14 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 9 Jun 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 2%. That’s in the top 21% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
Srimax has published a fix or advice.[3] CISA’s 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.”[1]
- Check whether you use it.Srimax Output Messenger is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed (fixed in version 2.0.63 of Output Messenger), or not in use. CISA gave US government agencies until 9 Jun 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 2%.[4] |
See also
Other path traversal flaws
- CVE-2025-61624, Fortinet products: path traversal ·
- CVE-2021-3199, ONLYOFFICE Docs: server path traversal ·
- CVE-2026-104286, Fortinet FortiMail: path traversal ·
- CVE-2026-93616, Check Point products: path traversal ·
- CVE-2026-66384, JFrog Artifactory: improper limitation of a pathname to a restricted directory ·
Added the same day
- CVE-2025-4428, Ivanti Endpoint Manager Mobile (EPMM): code injection ·
- CVE-2025-4427, Ivanti Endpoint Manager Mobile (EPMM): authentication bypass ·
- CVE-2024-27443, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting (XSS) ·
- CVE-2024-11182, MDaemon Email Server: cross-site scripting (XSS) ·
- CVE-2023-38950, ZKTeco BioTime: path traversal ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “Srimax Output Messenger Directory Traversal Vulnerability”. Known Exploited Vulnerabilities Catalog, added 19 May 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-27920 Detail”. National Vulnerability Database, published 5 May 2025.
- ^ Srimax. Advisories and fixes: outputmessenger.com, microsoft.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.019, percentile 79.3, 31 Oct 2026.
- CVE Program. “CVE-2025-27920”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.