CVE-2025-40833: CWE-476: NULL Pointer Dereference in Siemens IE/PB LINK HA
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2025-40833) affects Siemens IE/PB LINK HA devices and involves a null pointer dereference (CWE-476) when processing certain malformed IPv4 packets. The flaw leads to a denial of service condition by crashing or halting the device, necessitating a manual reboot. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low complexity, no privileges or user interaction required, and impact limited to availability. No vendor advisory or patch information is currently available, and the vulnerability is not related to cloud services.
Potential Impact
Successful exploitation results in denial of service, causing the affected device to become unresponsive until manually restarted. There is no impact on confidentiality or integrity reported. This can disrupt network operations relying on the Siemens IE/PB LINK HA device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor for unusual IPv4 traffic patterns that might trigger the vulnerability and plan for manual recovery procedures if a device becomes unresponsive.
CVE-2025-40833: CWE-476: NULL Pointer Dereference in Siemens IE/PB LINK HA
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-40833) affects Siemens IE/PB LINK HA devices and involves a null pointer dereference (CWE-476) when processing certain malformed IPv4 packets. The flaw leads to a denial of service condition by crashing or halting the device, necessitating a manual reboot. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low complexity, no privileges or user interaction required, and impact limited to availability. No vendor advisory or patch information is currently available, and the vulnerability is not related to cloud services.
Potential Impact
Successful exploitation results in denial of service, causing the affected device to become unresponsive until manually restarted. There is no impact on confidentiality or integrity reported. This can disrupt network operations relying on the Siemens IE/PB LINK HA device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, monitor for unusual IPv4 traffic patterns that might trigger the vulnerability and plan for manual recovery procedures if a device becomes unresponsive.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- siemens
- Date Reserved
- 2025-04-16T08:50:26.976Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a02f117cbff5d8610c13a4a
Added to database: 5/12/2026, 9:21:27 AM
Last enriched: 5/12/2026, 9:39:50 AM
Last updated: 5/13/2026, 4:47:06 AM
Views: 7
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