CVE-2015-8103 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability in org.jenkins-ci.main:cli. 8 public exploit references exist, so weaponization risk is real. A fix is available for org.jenkins-ci.main:cli — see the affected versions and patch details below.
Jenkins CLI Deserialization of Untrusted Data vulnerability
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-2015-8103 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE sits: patch-first territory.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
org.jenkins-ci.main:cli☕org.jenkins-ci.main:cliReal-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
The Jenkins CLI subsystem in Jenkins before 1.638 and LTS before 1.625.2 allows remote attackers to execute arbitrary code via a crafted serialized Java object, related to a problematic webapps/ROOT/WEB-INF/lib/commons-collections-*.jar file and the "Groovy variant in ysoserial".
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.jenkins-ci.main:cli | all versions | 1.625.2org.jenkins-ci.main:cli:1.625.2 |
| ☕Maven | org.jenkins-ci.main:cli | ≥ 1.626&&< 1.638 | 1.638org.jenkins-ci.main:cli:1.638 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Jenkins CLI - RMI Java Deserialization (Metasploit)
by Metasploit · Dec 15, 2015
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.main:cli, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.main:cli to 1.625.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-8103 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-2015-8103 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2015-8103. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift Enterprise 2.2 | activemq-0:5.9.0-6.redhat.611454.el6op | RHSA-2016:0489 |
| Red Hat OpenShift Enterprise 3.1 | atomic-openshift-0:3.1.1.6-1.git.0.b57e8bd.el7aos | RHSA-2016:0070 |
Frequently Asked Questions
Is CVE-2015-8103 in your dependencies?
O3 Security finds CVE-2015-8103 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.