Vulnerability record

CVE-2017-9805

Apache Struts Deserialization of Untrusted Data Vulnerability

HighExploitation confirmedCISA KEV

What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Struts, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by May 3, 2022.

Patch status

Official fix available since Sep 30, 2026

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Patch or advisory on oracle.com (opens in a new tab)

Description

The REST Plugin in Apache Struts 2.1.1 through 2.3.x before 2.3.34 and 2.5.x before 2.5.13 uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to Remote Code Execution when deserializing XML payloads.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

Products affected by this vulnerability, with versions and the source of each entry
Product	Vendor	Affected versions	Fixed in	Source
Struts	Apache Software Foundation	>= 2.1.2, < 2.3.34; >= 2.5.0, < 2.5.13	2.3.34; 2.5.13	KEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog.

Intelligence timeline

Developments from the last 30 days, newest first.

CVSS scoredUpdateKEVSep 30, 2026
CVE-2017-9805 scored CVSS 8.1: Apache Struts, Apache Struts Deserialization of Untrusted Data Vulnerability
CISA lists this as exploited in the wild. Unpatched Struts systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
Patch releasedUpdateKEVSep 30, 2026
Patch released for CVE-2017-9805: Apache Struts, Apache Struts Deserialization of Untrusted Data Vulnerability
An official fix is now available for Apache Struts. This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2017-9805
oracle.com http://www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html
securityfocus.com http://www.securityfocus.com/bid/100609
securitytracker.com http://www.securitytracker.com/id/1039263
blogs.apache.org https://blogs.apache.org/foundation/entry/apache-struts-statement-on-equifax
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1488482
cwiki.apache.org https://cwiki.apache.org/confluence/display/WW/S2-052
lgtm.com https://lgtm.com/blog/apache_struts_CVE-2017-9805
security.netapp.com https://security.netapp.com/advisory/ntap-20170907-0001/
struts.apache.org https://struts.apache.org/docs/s2-052.html
tools.cisco.com https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-struts2
exploit-db.com https://www.exploit-db.com/exploits/42627/
kb.cert.org https://www.kb.cert.org/vuls/id/112992
cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-9805