CVE-2025-12516 Lack of Graceful Error Handling - HTTP 5xx Error
Attackers can cause denial of service by triggering unhandled HTTP 5xx errors in Azure Access BLU-IC2 and BLU-IC4 controllers.
- 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-2025-12516?
CVE-2025-12516 is a critical denial of service vulnerability in Azure Access Technology BLU-IC2, published on 30 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Lack of Graceful Error Handling - HTTP 5xx ErrorThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .
Weakness: CWE-394
Which versions are affected by CVE-2025-12516?
It affects 2 products.
Products include Azure-Access Blu-Ic2 Firmware, Azure-Access Blu-Ic4 Firmware.
How do I fix CVE-2025-12516?
No fix has been published for CVE-2025-12516 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-12516 being exploited?
There is no known exploitation of CVE-2025-12516 in the wild and no public exploit code.
Other vulnerabilities in Azure Access Technology BLU-IC2
Sources
Also known as GHSA-5pqq-993m-xpc4.