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CVE-2018-1000861

Jenkins Stapler Web Framework Deserialization of Untrusted Data

9.8 CRITICALActively exploited (CISA KEV)EPSS 98.3%
  1. Published10 Dec 2018
  2. Added to CISA KEV10 Feb 2022
  3. Remediation due10 Aug 2022
Actively exploited (CISA KEV)

A code execution vulnerability exists in the Stapler web framework used by Jenkins

Added to KEV: 10 Feb 2022Federal remediation due: 10 Aug 2022

Description

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Jenkins≤ 2.153 · ≤ 2.138.3
Redhat Openshift Container Platform3.11

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2018-1000861 being actively exploited?

Yes. CVE-2018-1000861 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 10 Feb 2022.

How severe is CVE-2018-1000861?

CVE-2018-1000861 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 98.3% probability of exploitation.

Which products are affected by CVE-2018-1000861?

Affected products include Jenkins, Redhat Openshift Container Platform.

How do I fix CVE-2018-1000861?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-1000861 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.