MELSEC iQ-F Series FX5-ENET: Improper Validation of Specified Type of Input
CVE-2024-8403 is a high-severity improper validation of specified type of input vulnerability in MELSEC iQ-F Series FX5-ENET from Mitsubishi Electric, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected MELSEC iQ-F Series FX5-ENET versions: 1.100 to 1.200; 1.100 and later. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.68% chance of exploitation within 30 days, higher than 53% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of MELSEC iQ-F Series FX5-ENET you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on mitsubishielectric.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Mitsubishi Electric | MELSEC iQ-F Series FX5-ENET | 1.100 to 1.200; 1.100 and later | Not stated |
| Mitsubishi Electric | MELSEC iQ-F Series FX5-ENET/IP | 1.100 to 1.104; 1.100 through 1.104 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (yd.MitsubishiElectric.co.jp).
Official description
Improper Validation of Specified Type of Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET versions 1.100 to 1.200 and FX5-ENET/IP versions 1.100 to 1.104 allows a remote attacker to cause a Denial of Service condition in Ethernet communication of the products by sending specially crafted SLMP packets.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Validation of Specified Type of Input
The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
More Improper Validation of Specified Type of Input vulnerabilities (CWE-1287)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in MELSEC iQ-F Series FX5-ENET
- 7.5 High severity
Recent Improper Validation of Specified Type of Input vulnerabilities
- 7.5 High severity
- 8.8 High severity
- 8.6 High severity
- 7.7 High severity
- 7.5 High severity
- 9.8 Critical severity
ServiceNow Improper Input Validation Exploited
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