CVE-2026-8805 Denial-of-service (DoS) vulnerability in MELSEC iQ-F Series EtherNet/IP module
Remote attackers can cause denial of service in Mitsubishi MELSEC iQ-F EtherNet/IP modules by rapidly establishing numerous TCP connections, triggering an integer overflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8805?
CVE-2026-8805 is a high-severity vulnerability in Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-190
Which versions are affected by CVE-2026-8805?
How do I fix CVE-2026-8805?
No fix has been published for CVE-2026-8805 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-8805 being exploited?
There is no known exploitation of CVE-2026-8805 in the wild and no public exploit code.
Sources
Also known as GHSA-hc5r-cmjq-47w9.