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CVE-2017-9791: Apache Struts 1 Improper Input Validation Vulnerability

criticalknown exploitedpublic exploitCVE-2017-9791
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.
The Struts 1 plugin in Apache Struts might allow remote code execution via a malicious field value passed in a raw message to the ActionMessage.

CSIRTS triage

vendor: Apacheproduct: Struts 1Remote code execution
What
The Struts 1 plugin might allow remote code execution via a malicious field value.
Who is affected
Deployments of Apache Struts 1 are affected.
Urgency
Remediation is urgent due to the critical severity and exploitation status.
Action
Upgrade to a patched version of Apache Struts.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-02-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-9791

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-2017-9791coverage & exploitation statusNVD · CVE.org

Recent advisories for Apache Struts

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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