CVE-2024-8063 Divide by Zero in ollama/ollama

What is CVE-2024-8063?

CVE-2024-8063 is a high-severity denial of service vulnerability in ollama/ollama, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A divide by zero vulnerability exists in ollama/ollama version v0.3.3. The vulnerability occurs when importing GGUF models with a crafted type for `block_count` in the Modelfile. This can lead to a denial of service (DoS) condition when the server processes the model, causing it to crash.

Weakness: CWE-369

Which versions are affected by CVE-2024-8063?

3 open source packages ship an affected version, including github.com/ollama/ollama. It affects 1 product.

Products include Ollama Ollama.

How do I fix CVE-2024-8063?

Upgrade to a fixed version.

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-2024-8063 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-8063 exists.

Other vulnerabilities in ollama/ollama

• CVE-2025-63389 Ollama Platform has missing authentication enabling attackers to perform model management operations Critical 9.8
• CVE-2024-45436 Ollama can extract members of a ZIP archive outside of the parent directory Critical 9.1
• CVE-2026-7482 Ollama heap out-of-bounds read in GGUF tensor parsing leaks server process memory to unauthenticated remote attackers High 8.8
• CVE-2024-37032 Ollama does not validate the format of the digest (sha256 with 64 hex digits) High 8.8
• CVE-2025-15514 Ollama Multi-Modal Model Image Processing NULL Pointer Dereference High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2xf2-gjm6-g2c6, GO-2025-3689, MINI-28gh-6r35-4p34, MINI-p228-49j2-2v32.