Mitsubishi Electric MELSEC iQ-F FX5U-32MT improper validation of specified index, position, or offset in input

CVSS Meta Temp Score
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CTI Interest Score
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9.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Mitsubishi Electric MELSEC iQ-F FX5U-32MT, MELSEC iQ-F FX5U-32MR, MELSEC iQ-F FX5U-64MT, MELSEC iQ-F FX5U-64MR, MELSEC iQ-F FX5U-80MT, MELSEC iQ-F FX5U-80MR, MELSEC iQ-F FX5UC-32MT, D, MELSEC iQ-F FX5UC-64MT, MELSEC iQ-F FX5UC-96MT, DS-TS, DSS-TS, MELSEC iQ-F FX5UC-32MR, MELSEC iQ-F FX5UJ-24MT, MELSEC iQ-F FX5UJ-24MR, MELSEC iQ-F FX5UJ-40MT, MELSEC iQ-F FX5UJ-40MR, MELSEC iQ-F FX5UJ-60MT, MELSEC iQ-F FX5UJ-60MR, ES-A, MELSEC iQ-F FX5S-30MT, MELSEC iQ-F FX5S-30MR, MELSEC iQ-F FX5S-40MT, MELSEC iQ-F FX5S-40MR, MELSEC iQ-F FX5S-60MT, MELSEC iQ-F FX5S-60MR, MELSEC iQ-F FX5S-80MT and MELSEC iQ-F FX5S-80MR. It has been declared as very critical. This impacts an unknown function. Such manipulation leads to improper validation of specified index, position, or offset in input. This vulnerability is traded as CVE-2025-3755. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Mitsubishi Electric MELSEC iQ-F FX5U-32MT, MELSEC iQ-F FX5U-32MR, MELSEC iQ-F FX5U-64MT, MELSEC iQ-F FX5U-64MR, MELSEC iQ-F FX5U-80MT, MELSEC iQ-F FX5U-80MR, MELSEC iQ-F FX5UC-32MT, D, MELSEC iQ-F FX5UC-64MT, MELSEC iQ-F FX5UC-96MT, DS-TS, DSS-TS, MELSEC iQ-F FX5UC-32MR, MELSEC iQ-F FX5UJ-24MT, MELSEC iQ-F FX5UJ-24MR, MELSEC iQ-F FX5UJ-40MT, MELSEC iQ-F FX5UJ-40MR, MELSEC iQ-F FX5UJ-60MT, MELSEC iQ-F FX5UJ-60MR, ES-A, MELSEC iQ-F FX5S-30MT, MELSEC iQ-F FX5S-30MR, MELSEC iQ-F FX5S-40MT, MELSEC iQ-F FX5S-40MR, MELSEC iQ-F FX5S-60MT, MELSEC iQ-F FX5S-60MR, MELSEC iQ-F FX5S-80MT and MELSEC iQ-F FX5S-80MR. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a improper validation of specified index, position, or offset in input vulnerability. Using CWE to declare the problem leads to CWE-1285. The product receives input that is expected to specify an index, position, or offset into an indexable resource such as a buffer or file, but it does not validate or incorrectly validates that the specified index/position/offset has the required properties. Impacted is confidentiality, and availability. CVE summarizes:

Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules allows a remote unauthenticated attacker to read information in the product, to cause a Denial-of-Service (DoS) condition in MELSOFT connection, or to stop the operation of the CPU module (causing a DoS condtion on the CPU module), by sending specially crafted packets. The product is needed to reset for recovery.

The advisory is shared for download at mitsubishielectric.com. This vulnerability is handled as CVE-2025-3755 since 04/17/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/27/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 9.1

VulDB Base Score: 9.1
VulDB Temp Score: 9.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (Mitsubishi): 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper validation of specified index, position, or offset in input
CWE: CWE-1285
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/17/2025 🔍
05/29/2025 +42 days 🔍
05/29/2025 +0 days 🔍
08/27/2025 +90 days 🔍

Sourcesinfo

Advisory: mitsubishielectric.com
Status: Confirmed

CVE: CVE-2025-3755 (🔍)
GCVE (CVE): GCVE-0-2025-3755
GCVE (VulDB): GCVE-100-310484

Entryinfo

Created: 05/29/2025 09:18
Updated: 08/27/2025 11:07
Changes: 05/29/2025 09:18 (59), 08/27/2025 11:07 (1)
Complete: 🔍
Cache ID: 216::103

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