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
CVE-2025-40833 is a null pointer dereference vulnerability (CWE-476) affecting Siemens IE/PB LINK HA devices. The flaw occurs during the processing of specially crafted IPv4 requests, which can lead to a denial of service by crashing the device. Recovery from this condition requires a manual restart. There is no vendor advisory or patch currently available, and no known exploits in the wild have been reported. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Successful exploitation results in a denial of service condition on affected Siemens IE/PB LINK HA devices, causing them to become unresponsive until manually restarted. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network-level protections such as filtering or rate limiting specially crafted IPv4 packets targeting the device may reduce exposure. Monitor vendor communications for updates on official fixes or mitigations.
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.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-40833 is a null pointer dereference vulnerability (CWE-476) affecting Siemens IE/PB LINK HA devices. The flaw occurs during the processing of specially crafted IPv4 requests, which can lead to a denial of service by crashing the device. Recovery from this condition requires a manual restart. There is no vendor advisory or patch currently available, and no known exploits in the wild have been reported. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
Successful exploitation results in a denial of service condition on affected Siemens IE/PB LINK HA devices, causing them to become unresponsive until manually restarted. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, network-level protections such as filtering or rate limiting specially crafted IPv4 packets targeting the device may reduce exposure. Monitor vendor communications for updates on official fixes or mitigations.
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: 05/12/2026, 09:21:27 UTC
Last enriched: 07/15/2026, 11:30:40 UTC
Last updated: 07/31/2026, 19:22:55 UTC
Views: 123
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