Is CVE-2021-37705 actively exploited?

No active exploitation of CVE-2021-37705 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-37705 be exploited remotely?

Yes. CVE-2021-37705 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-37705?

CVE-2021-37705 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2021-37705

CRITICAL

CVE-2021-37705

CWE-285Published: August 13, 2021· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

OneFuzz is an open source self-hosted Fuzzing-As-A-Service platform. Starting with OneFuzz 2.12.0 or greater, an incomplete authorization check allows an authenticated user from any Azure Active Directory tenant to make authorized API calls to a vulnerable OneFuzz instance. To be vulnerable, a OneFuzz deployment must be both version 2.12.0 or greater and deployed with the non-default --multi_tenant_domain option. This can result in read/write access to private data such as software vulnerability and crash information, security testing tools and proprietary code and symbols. Via authorized API calls, this also enables tampering with existing data and unauthorized code execution on Azure compute resources. This issue is resolved starting in release 2.31.0, via the addition of application-level check of the bearer token's `issuer` against an administrator-configured allowlist. As a workaround users can restrict access to the tenant of a deployed OneFuzz instance < 2.31.0 by redeploying in the default configuration, which omits the `--multi_tenant_domain` option.

NVD Source

Technical Analysis

CVE-2021-37705 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.