CVE-2021-33036 is a high-severity (CVSS 8.8) CWE-24 vulnerability in org.apache.hadoop:hadoop-yarn-server-common. A fix is available for org.apache.hadoop:hadoop-yarn-server-common — see the affected versions and patch details below.
User account escalation in Apache Hadoop
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-2021-33036 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 377,636 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.apache.hadoop:hadoop-yarn-server-common☕org.apache.hadoop:hadoop-yarn-server-common☕org.apache.hadoop:hadoop-yarn-server-commonReal-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
In Apache Hadoop 2.2.0 to 2.10.1, 3.0.0-alpha1 to 3.1.4, 3.2.0 to 3.2.2, and 3.3.0 to 3.3.1, a user who can escalate to yarn user can possibly run arbitrary commands as root user. Users should upgrade to Apache Hadoop 2.10.2, 3.2.3, 3.3.2 or higher.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.apache.hadoop:hadoop-yarn-server-common | ≥ 2.2.0&&< 2.10.2 | 2.10.2org.apache.hadoop:hadoop-yarn-server-common:2.10.2 |
| ☕Maven | org.apache.hadoop:hadoop-yarn-server-common | ≥ 3.0.0&&< 3.2.3 | 3.2.3org.apache.hadoop:hadoop-yarn-server-common:3.2.3 |
| ☕Maven | org.apache.hadoop:hadoop-yarn-server-common | ≥ 3.3.0&&< 3.3.2 | 3.3.2org.apache.hadoop:hadoop-yarn-server-common:3.3.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.hadoop:hadoop-yarn-server-common, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.hadoop:hadoop-yarn-server-common to 2.10.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-33036 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-2021-33036 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2021-33036. 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-2021-33036 in your dependencies?
O3 Security finds CVE-2021-33036 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.