Mitsubishi Electric MELSEC iQ-F FX5-EIP EtherNet IP Module FX5-EIP integer overflow

Summaryinfo

A vulnerability labeled as critical has been found in Mitsubishi Electric MELSEC iQ-F FX5-EIP EtherNet IP Module FX5-EIP. This vulnerability affects unknown code. Executing a manipulation can lead to integer overflow. This vulnerability appears as CVE-2026-8805. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in Mitsubishi Electric MELSEC iQ-F FX5-EIP EtherNet IP Module FX5-EIP (the affected version unknown) and classified as critical. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect availability. CVE summarizes:

Integer Overflow or Wraparound vulnerability in the EtherNet/IP function of Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP module FX5-EIP versions 1.000 and prior allows a remote attacker to cause a denial-of-service (DoS) condition in the affected product by rapidly establishing a large number of TCP connections to it, resulting in an inconsistency in the product's internal connection management process and triggering improper memory access.

The advisory is available at mitsubishielectric.com. This vulnerability was named CVE-2026-8805 since 05/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/19/2026).

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Mitsubishi Electric

Name

• MELSEC iQ-F FX5-EIP EtherNet IP Module FX5-EIP

License

• commercial

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion