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CVE-2025-15514— Ollama Multi-Modal Model Image Processing NULL Pointer Dereference

Quick assessment

Affected
Ollama Ollama
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ollama是Ollama开源的一个可以在本地启动并运行的大型语言模型。 Ollama 0.11.5-rc0版本至0.13.5版本存在安全漏洞，该漏洞源于多模态模型图像处理功能存在空指针取消引用，可能导致拒绝服务。

CVSS 8.7 · High EPSS 0.78% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
Ollama Ollama v0.11.5-rc0≤ 0.13.5 affected
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I. Basic Information for CVE-2025-15514

Vulnerability Information
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Vulnerability Title
Ollama Multi-Modal Model Image Processing NULL Pointer Dereference
Source: CVE Program / CVE List V5
Vulnerability Description
Ollama 0.11.5-rc0 through current version 0.13.5 contain a null pointer dereference vulnerability in the multi-modal model image processing functionality. When processing base64-encoded image data via the /api/chat endpoint, the application fails to validate that the decoded data represents valid media before passing it to the mtmd_helper_bitmap_init_from_buf function. This function can return NULL for malformed input, but the code does not check this return value before dereferencing the pointer in subsequent operations. A remote attacker can exploit this by sending specially crafted base64 image data that decodes to invalid media, causing a segmentation fault and crashing the runner process. This results in a denial of service condition where the model becomes unavailable to all users until the service is restarted.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用NullPointerException捕捉来检测空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Ollama 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ollama是Ollama开源的一个可以在本地启动并运行的大型语言模型。 Ollama 0.11.5-rc0版本至0.13.5版本存在安全漏洞，该漏洞源于多模态模型图像处理功能存在空指针取消引用，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ollama Ollama v0.11.5-rc0 ~ 0.13.5 -

II. Public POCs for CVE-2025-15514

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III. Intelligence Information for CVE-2025-15514

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Other References for CVE-2025-15514 (1)

IV. Related Vulnerabilities

Same product: Ollama
Same vendor: Ollama
Same weakness: CWE-395

V. Comments for CVE-2025-15514

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