High severity · published May 12, 2026
CVE-2025-40833
The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IL
IE/PB LINK HA · Siemens
before V4.1.2 · source: vendor
IL
IE/PB link PN IO · Siemens
0 · source: vendor
RR
RUGGEDCOM RM1224 LTE(4G) EU · Siemens
before V8.3 · source: vendor
RR
RUGGEDCOM RM1224 LTE(4G) NAM · Siemens
before V8.3 · source: vendor
SM
SCALANCE M804PB · Siemens
before V8.3 · source: vendor
SM
SCALANCE M812-1 ADSL-Router · Siemens
before V8.3; before V8.3 · source: vendor
SM
SCALANCE M816-1 ADSL-Router · Siemens
before V8.3; before V8.3 · source: vendor
SM
SCALANCE M826-2 SHDSL-Router · Siemens
before V8.3 · source: vendor
SM
SCALANCE M874-2 · Siemens
before V8.3 · source: vendor
SM
SCALANCE M874-3 · Siemens
before V8.3 · source: vendor
SM
SCALANCE M874-3 3G-Router (CN) · Siemens
before V8.3 · source: vendor
SM
SCALANCE M876-3 · Siemens
before V8.3 · source: vendor