CVE-2025-27257

Malicious firmware installation via client-only signature verification

Published Mar 10, 2025 · Updated Mar 12, 2025

Firmware authenticity failure in GE Vernova Multilin UR IED devices 7.0 through 8.60 allows remote authenticated users to install modified firmware. EnerVista UR Setup performs signature verification only in the client, while the relay accepts firmware without independently enforcing that integrity decision. High-privilege access to the adjacent-network management path is required, and successful exploitation permits persistent alteration of device behavior.

CVSS severity6.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Firmware authenticity failure in GE Vernova Multilin UR IED devices 7.0 through 8.60 allows remote authenticated users to install modified firmware. EnerVista UR Setup performs signature verification only in the client, while the relay accepts firmware without independently enforcing that integrity decision. High-privilege access to the adjacent-network management path is required, and successful exploitation permits persistent alteration of device behavior.

The record

CVE
CVE-2025-27257
Published
Mar 10, 2025
Updated
Mar 12, 2025
Vendor
GE Vernova
Product
Multilin L90
Classifications
CWE-345, CAPEC-638, T1693.001
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Mar 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0 <=8.60

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

GE Vernova · Multilin L90version=7.0 <=8.60
GE Vernova · Multilin G30version=7.0 <=8.60
GE Vernova · Multilin L30version=7.0 <=8.60
GE Vernova · Multilin B30version=7.0 <=8.60
GE Vernova · Multilin L60version=7.0 <=8.60
GE Vernova · Multilin C30version=7.0 <=8.60
GE Vernova · Multilin C60version=7.0 <=8.60
GE Vernova · Multilin B90version=7.0 <=8.60
GE Vernova · Multilin T35version=7.0 <=8.60
GE Vernova · Multilin M60version=7.0 <=8.60
GE Vernova · Multilin F35version=7.0 <=8.60
GE Vernova · Multilin N60version=7.0 <=8.60
GE Vernova · Multilin D60version=7.0 <=8.60
GE Vernova · Multilin D30version=7.0 <=8.60
GE Vernova · Multilin T60version=7.0 <=8.60
GE Vernova · Multilin F60version=7.0 <=8.60
GE Vernova · Multilin C70version=7.0 <=8.60
GE Vernova · Multilin C95version=7.0 <=8.60
GE Vernova · Multilin G60version=7.0 <=8.60

Published CVSS scores

6.1Nozomi Networks Inc.CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CAPEC-638Altered Component Firmware
T1693.001System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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