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CVE-2017-9805: Apache Struts Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2017-9805
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Apache Struts REST Plugin 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.

CSIRTS triage

vendor: Apacheproduct: StrutsUnsafe deserialization
What
Apache Struts REST Plugin uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to remote code execution.
Who is affected
Deployments of Apache Struts REST Plugin.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update Apache Struts to the latest version.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-9805

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2017-9805coverage & exploitation statusNVD · CVE.org

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