CVE-2026-8479CWE-476

IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable for a NULL pointer dereferencing, if a specially crafted sequence of messages is sent for a…

Medium · published May 26, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
15.1
In the wild
Unconfirmed
What it is

IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable

for a NULL pointer dereferencing, if a specially crafted

sequence of messages is sent for a certain time, causing

Denial of Service impact.

Product is only affected if IEC 60870-5-104 functionality in

bidirectional mode (BCI) is configured.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00247 · 15.1th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-05-26T11:54Z
EPSS history
Timeline
  • 26 MAY 11:54Z
    IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable for a NULL pointer dereferencing, if a specially crafted sequence of messages is sent for a…
    cvelistv5