Is CVE-2023-39967 actively exploited?

No active exploitation of CVE-2023-39967 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-39967 be exploited remotely?

Yes. CVE-2023-39967 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-39967?

CVE-2023-39967 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2023-39967

CRITICAL

CVE-2023-39967

CWE-918Published: September 6, 2023· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

WireMock is a tool for mocking HTTP services. When certain request URLs like “@127.0.0.1:1234" are used in WireMock Studio configuration fields, the request might be forwarded to an arbitrary service reachable from WireMock’s instance. There are 3 identified potential attack vectors: via “TestRequester” functionality, webhooks and the proxy mode. As we can control HTTP Method, HTTP Headers, HTTP Data, it allows sending requests with the default level of credentials for the WireMock instance. The vendor has discontinued the affected Wiremock studio product and there will be no fix. Users are advised to find alternatives.

NVD Source

Technical Analysis

CVE-2023-39967 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.