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CISA KEV · Known exploitedHigh

CVE-2018-11776

Apache Struts

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.

CVSS
8.1
EPSS
100.0%
100.0% percentile
CISA KEV
Listed
Published
2018.08.22
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability100.0%
Technical severityCVSS 8.1

Vulnerability overview

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.

Affected product and versions

Product
Apache Struts
Affected versions
2.3 to 2.3.34, 2.5 to 2.5.16, >= 2.0.4 < 2.3.35, >= 2.5.0 < 2.5.17, >= 7.3, >= 9.5, < 12.5.0, 13.3.0.0, 13.4.0.0, <= 3.4.9.4237, >= 4.0.0 <= 4.0.6.5281, >= 8.0.0 <= 8.0.2.8191
Fixed versions
2.3.35, 2.5.17, 12.5.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.03
  1. 1
    Identify

    Confirm that Apache Struts and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20
KEV added
2021.11.03
Ransomware use
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