CVE-2023-41329 — wiremock-standalone
LOWCVE-2023-41329 is a low-severity (CVSS 3.9) CWE-290 vulnerability in org.wiremock:wiremock-standalone. A fix is available for org.wiremock:wiremock-standalone — see the affected versions and patch details below.
Domain restrictions bypass via DNS Rebinding in WireMock and WireMock Studio
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-41329.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2023-41329 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
org.wiremock:wiremock-standalone☕org.wiremock:wiremock☕com.github.tomakehurst:wiremock-jre8☕com.github.tomakehurst:wiremock-jre8-standalone🐍wiremockReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.wiremock:wiremock-standalone | all versions | 3.0.3org.wiremock:wiremock-standalone:3.0.3 |
| ☕Maven | org.wiremock:wiremock | all versions | 3.0.3org.wiremock:wiremock:3.0.3 |
| ☕Maven | com.github.tomakehurst:wiremock-jre8 | all versions | 2.35.1com.github.tomakehurst:wiremock-jre8:2.35.1 |
| ☕Maven | com.github.tomakehurst:wiremock-jre8-standalone | all versions | 2.35.1com.github.tomakehurst:wiremock-jre8-standalone:2.35.1 |
| 🐍PyPI | wiremock | all versions | 2.6.1pip install --upgrade 'wiremock==2.6.1' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.wiremock:wiremock-standalone, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.wiremock:wiremock-standalone to 3.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-41329 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2023-41329 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2023-41329. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-41329 in your dependencies?
O3 Security finds CVE-2023-41329 across Maven, PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.