CVE-2017-9805: in the CISA KEV catalogue
Apache Struts Deserialization of Untrusted Data Vulnerability. CISA added CVE-2017-9805 to the Known Exploited Vulnerabilities catalogue on 2021-11-03 with a default due date of 2022-05-03. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- Apache Struts
- CWE
- CWE-502
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 99%, percentile 99 (scored 2026-11-03)
EPSS puts about 99 in 100 odds (99%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2017-9805 in the CISA KEV catalogue?
Yes. CISA added CVE-2017-9805 (Apache Struts Deserialization of Untrusted Data Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2021-11-03. CISA's default due date for it is 2022-05-03.
Is CVE-2017-9805 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2017-9805. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2017-9805?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2017-9805