CVE-2025-63389

Published Dec 18, 2025

Last updated 5 months ago

CVSS critical 9.8

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-63389 describes an authentication bypass vulnerability found in the API endpoints of the Ollama platform, specifically in versions up to and including v0.12.3. This flaw stems from a lack of proper authentication mechanisms on critical API endpoints. As a result, remote attackers can exploit this vulnerability to interact with the Ollama API without providing credentials, enabling them to perform unauthorized model management operations such as creating, deleting, or modifying models.

Description
A critical authentication bypass vulnerability exists in Ollama platform's API endpoints in versions prior to and including v0.12.3. The platform exposes multiple API endpoints without requiring authentication, enabling remote attackers to perform unauthorized model management operations.
Source
cve@mitre.org
NVD status
Modified
Products
ollama

Risk scores

CVSS 3.1

Type
Secondary
Base score
9.8
Impact score
5.9
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity
CRITICAL

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE-306

Social media

Hype score
Not currently trending

  1. GitHub - nuclide-research/VisorGoose: Gov-TLD Ollama discovery via CT logs, Shodan, and DNS; detects CVE-2025-63389, cloud proxy takeovers, and RAG/distilled models across 25 government TLD patterns. · GitHub https://t.co/y0D16WW5FJ

    @akaclandestine

    4 Jun 2026

    908 Impressions

    2 Retweets

    11 Likes

    8 Bookmarks

    0 Replies

    0 Quotes

  2. @DukeU server running Ollama with two agent-configured variants of Qwen 3.6-27B, both with system prompts instructing file-inspection behavior and native function-calling enabled. Raw Ollama port publicly accessible. Model injection via CVE-2025-63389 would silently redirect

    @n15647931

    3 May 2026

    138 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  3. CVE-2025-63389 A critical authentication bypass vulnerability exists in Ollama platform's API endpoints in versions prior to and including v0.12.3. The platform exposes multiple API… https://t.co/BCTCvaPcDT

    @CVEnew

    20 Dec 2025

    82 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  4. Ollama Platform affected by missing authentication (CVE-2025-63389), allowing unauthorized model management. Secure API access and monitor for official updates. https://t.co/rg5ROC6dOn

    @pulsepatchio

    19 Dec 2025

    5 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

Configurations

Related CVEs

  1. Unauthenticated remote information disclosure vulnerability in Ollama's model quantization engine allows an attacker to read and exfiltrate the server's heap memory, potentially leading to sensitive data exposure, further compromise, and stealthy persistence.•CVE-2026-5757
  2. Ollama before 0.17.1 contains a heap out-of-bounds read vulnerability in the GGUF model loader. The /api/create endpoint accepts an attacker-supplied GGUF file in which the declared tensor offset and size exceed the file's actual length; during quantization in fs/ggml/gguf.go and server/quantization.go (WriteTo()), the server reads past the allocated heap buffer. The leaked memory contents may include environment variables, API keys, system prompts, and concurrent users' conversation data, and can be exfiltrated by uploading the resulting model artifact through the /api/push endpoint to an attacker-controlled registry. The /api/create and /api/push endpoints have no authentication in the upstream distribution. Default deployments bind to 127.0.0.1, but the documented OLLAMA_HOST=0.0.0.0 configuration is widely used in practice (large public-internet exposure observed).•CVE-2026-7482
  3. Ollama for Windows contains a Remote Code Execution vulnerability in its update mechanism due to improper handling of attacker‑controlled HTTP response headers. When downloading updates, the application constructs local file paths using values derived from HTTP headers without validation. These values are passed directly to filepath.Join, allowing path traversal sequences (../) to be resolved and enabling files to be written outside the intended update staging directory. An attacker who can influence update responses can exploit this flaw to write arbitrary executables to attacker‑chosen locations accessible to the current user, including the Windows Startup directory. This allows execution of arbitrary executables. Critically, when chained with CVE‑2026‑42248 (Missing Signature Verification for Updates), an attacker can deliver malicious payloads that are written to sensitive locations and executed automatically. Because Ollama for Windows performs silent automatic updates and executes staged binaries without user interaction, this results in automatic and persistent code execution without user awareness. Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.•CVE-2026-42249
  4. Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later executed by the application. Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness. Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.•CVE-2026-42248
  5. A security flaw has been discovered in Ollama up to 0.20.2. This affects the function digestToPath of the file x/imagegen/transfer/transfer.go of the component Tensor Model Transfer Handler. The manipulation of the argument digest results in path traversal. The attack may be performed from remote. This attack is characterized by high complexity. The exploitability is reported as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.•CVE-2026-7020

References

Sources include official advisories and independent security research.