io.undertow:undertow-core Known Vulnerabilities & Fixes
io.undertow:undertow-core has 2 known security vulnerabilities in Maven (Java). Upgrade to version 2.3.21.Final or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 2.3.21.Final
Upgrading to 2.3.21.Final or later resolves all 2 known vulnerabilities in io.undertow:undertow-core. Update your pom.xml or build.gradle to version 2.3.21.Final.
Is io.undertow:undertow-core in your project?
Check if you're affected and upgrade to 2.3.21.Final to stay secure.
Security Summary
- 4 affected version ranges have been identified across these 2 advisories.
- 100% of known issues have a published fixed version.
- Remediation: Update the io.undertow:undertow-core version in your pom.xml or build.gradle
Vulnerabilities
2 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed Feb 23, 2023, most recently Jan 7, 2026 (1049 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2025-12543 Undertow HTTP server core doesn't properly validate the Host header in incoming HTTP requests | CRITICAL | 2.4.0.Alpha1, 2.3.0.Alpha1, 2.3.0.Alpha2, 2.3.0.Beta1 (+328 more) | 2.3.21.Final, 2.2.39.Final |
| CVE-2022-4492 Undertow client not checking server identity presented by server certificate in https connections | CRITICAL | 2.3.0.Final, 2.3.1.Final, 2.3.2.Final, 2.3.3.Final (+293 more) | 2.3.5.Final, 2.2.24.Final |
About This Data
Vulnerability data for io.undertow:undertow-core is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related Maven (Java) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
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