CVE-2025-40833 Null dereference in IE/PB LINK HA
Attackers can cause denial of service on Siemens industrial network devices via crafted IPv4 requests, requiring manual restart for recovery.
- 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-2025-40833?
CVE-2025-40833 is a high-severity vulnerability in Siemens IE/PB LINK HA, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2025-40833?
How do I fix CVE-2025-40833?
No fix has been published for CVE-2025-40833 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-40833 being exploited?
There is no known exploitation of CVE-2025-40833 in the wild and no public exploit code.
Sources
Also known as GHSA-9483-pcvr-wj53.