CVE-2023-41329

What it is

WireMock is a tool for mocking HTTP services. The proxy mode of WireMock, can be protected by the network restrictions configuration, as documented in Preventing proxying to and recording from specific target addresses. These restrictions can be configured using the domain names, and in such a case the configuration is vulnerable to the DNS rebinding attacks. A similar patch was applied in WireMock 3.0.0-beta-15 for the WireMock Webhook Extensions. The root cause of the attack is a defect in the logic which allows for a race condition triggered by a DNS server whose address expires in between the initial validation and the outbound network request that might go to a domain that was supposed to be prohibited. Control over a DNS service is required to exploit this attack, so it has high execution complexity and limited impact. This issue has been addressed in version 2.35.1 of wiremock-jre8 and wiremock-jre8-standalone, version 3.0.3 of wiremock and wiremock-standalone, version 2.6.1 of the python version of wiremock, and versions 2.35.1-1 and 3.0.3-1 of the wiremock/wiremock Docker container. Users are advised to upgrade. Users unable to upgrade should either configure firewall rules to define the list of permitted destinations or to configure WireMock to use IP addresses instead of the domain names.

At a glance

Exploitability

Can be exploited from the same network segment with an admin-level account. Limited direct impact.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-09-06 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 06:21 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 3.9 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-09-06 21:15 UTC

Last modified

2026-06-17 06:21 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-290

Record status

Modified

Affected

• Wiremock Python Wiremock < 2.6.1
• Wiremock Studio ≤ 2.32.0-17
• Wiremock < 2.35.1
• Wiremock < 3.0.3
• Wiremock Docker < 2.35.1-1
• Wiremock Docker < 3.0.3-1

Attack profile CVSS 3.1 · 3.9

Attack vector

Adjacent network

Complexity

High

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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