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CISA KEV · Known exploitedCritical

CVE-2017-9791

Apache Struts 1

The Struts 1 plugin in Apache Struts 2.1.x and 2.3.x might allow remote code execution via a malicious field value passed in a raw message to the ActionMessage.

CVSS
9.8
EPSS
98.8%
99.9% percentile
CISA KEV
Listed
Published
2017.07.11
PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV
Exploit probability98.8%
Technical severityCVSS 9.8

Vulnerability overview

The Struts 1 plugin in Apache Struts 2.1.x and 2.3.x might allow remote code execution via a malicious field value passed in a raw message to the ActionMessage.

Affected product and versions

Product
Apache Struts 1
Affected versions
2.1.x series, 2.3.x series, 2.3.1, 2.3.1.1, 2.3.1.2, 2.3.3, 2.3.4, 2.3.4.1, 2.3.7, 2.3.8, 2.3.12, 2.3.14, 2.3.14.1, 2.3.14.2, 2.3.14.3, 2.3.15, 2.3.15.1, 2.3.15.2, 2.3.15.3, 2.3.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.08.10
  1. 1
    Identify

    Confirm that Apache Struts 1 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:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20
KEV added
2022.02.10
Ransomware use
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