CVE-2025-37731
MEDIUMCVE-2025-37731 is a medium-severity (CVSS 6.8) Improper Authentication vulnerability in org.elasticsearch:elasticsearch. O3 Security confirms whether CVE-2025-37731 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Elasticsearch Improper Authentication
Real-World Exposure
org.elasticsearch:elasticsearch☕org.elasticsearch:elasticsearch☕org.elasticsearch:elasticsearchReal-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
Improper Authentication in Elasticsearch PKI realm can lead to user impersonation via specially crafted client certificates. A malicious actor would need to have such a crafted client certificate signed by a legitimate, trusted Certificate Authority.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.elasticsearch:elasticsearch | ≥ 7.0.0-alpha1&&< 8.19.8 | 8.19.8 |
| ☕Maven | org.elasticsearch:elasticsearch | ≥ 9.0.0-beta1&&< 9.1.8 | 9.1.8 |
| ☕Maven | org.elasticsearch:elasticsearch | ≥ 9.2.0&&< 9.2.2 | 9.2.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.elasticsearch:elasticsearch. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update org.elasticsearch:elasticsearch to 8.19.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-37731 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 pinpoints whether CVE-2025-37731 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2025-37731. 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-2025-37731 in your dependencies?
O3 detects CVE-2025-37731 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.