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PatchSiren cyber security CVE debrief

CVE-2025-27920 Srimax CVE debrief

CVE-2025-27920 is a Srimax Output Messenger directory traversal vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2025-05-19. Because it is in KEV, defenders should treat it as an urgent remediation item and verify whether any Output Messenger deployments are exposed or still in service. The supplied corpus does not include affected versions or patch details, so remediation should follow the vendor’s guidance and CISA’s required actions.

Vendor
Srimax
Product
Output Messenger
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-05-19
Original CVE updated
2025-05-19
Advisory published
2025-05-19
Advisory updated
2025-05-19

Who should care

Security teams, system administrators, and application owners responsible for Srimax Output Messenger deployments, especially environments that expose the product to untrusted users or the internet. Cloud-service owners should also assess CISA BOD 22-01 obligations where applicable.

Technical summary

The issue is described as a directory traversal vulnerability in Srimax Output Messenger. Directory traversal flaws can let an attacker reach files or paths outside the intended directory structure if input handling is insufficient. The corpus provided here does not include exploit mechanics, affected versions, or a fixed release, but CISA’s KEV listing indicates the vulnerability is known to be exploited and requires prompt mitigation.

Defensive priority

Urgent. CISA’s KEV inclusion means this should be prioritized ahead of routine backlog work, with remediation completed by the KEV due date where possible.

Recommended defensive actions

  • Review the vendor advisory and apply the vendor-recommended mitigation or patch as soon as possible.
  • Confirm whether any Srimax Output Messenger instances are deployed, including any internet-facing or externally reachable systems.
  • If mitigations are unavailable, follow CISA guidance to discontinue use of the product.
  • For cloud services, follow applicable CISA BOD 22-01 guidance and document compensating controls.
  • Check for abnormal file access, path traversal indicators, and unexpected application behavior in logs and monitoring data.
  • Track remediation against the CISA KEV due date of 2025-06-09 and escalate any unpatched exposure.

Evidence notes

The supplied source corpus contains CISA KEV metadata, the CVE published/modified date of 2025-05-19, and official links to the CVE record, NVD entry, and CISA KEV catalog. It also references a vendor advisory URL in the KEV metadata notes, but the advisory content itself was not included in the corpus. No CVSS score or affected-version list was supplied.

Official resources

CISA added CVE-2025-27920 to the Known Exploited Vulnerabilities catalog on 2025-05-19, with a due date of 2025-06-09. This debrief uses the supplied CVE and KEV dates only; no generation or review date was treated as the vulnerability date